A good car phone mount needs to keep your phone secure without becoming another thing you have to worry about while driving. The LISEN A690 Electric Vacuum Magnetic Car Mount takes an interesting approach by using an electronic vacuum system instead of relying solely on a conventional suction cup.
It combines automatic vacuum control with a MagSafe-compatible magnetic mount and a four-axis adjustment system. The result is a phone holder that offers more technology than a typical car mount, although that also comes with a few compromises.
Compact and Solid Design
The LISEN A690 has a compact 64 × 58 × 50mm footprint and combines CNC-machined zinc alloy with impact-resistant ABS and PC, along with soft silicone components. The metal construction gives it a solid feel, while the combination of materials keeps the overall design relatively compact.
The magnetic mounting surface also gives it a cleaner appearance than traditional clamp-style holders. No arms surround the phone, which makes attaching and removing the device quick.
The trade-off is that it is more substantial than a basic magnetic mount because it has an electronic vacuum pump and battery built into the body. If you prefer an extremely lightweight and simple phone holder, this isn’t that type of product.
Smart Electronic Auto-Vacuum System
The main feature is its Smart Electronic Auto-Vacuum Suction System. Instead of relying on a manual lever, sticky gel pad, or mechanical twist-lock, it uses an electronic pump and pressure sensors to create and maintain its vacuum seal.
Once the suction base is pressed against a suitable flat and smooth surface, the system automatically activates to remove air from the vacuum chamber and secure the mount. It can generate negative adsorption pressure from approximately 18KPa up to 65KPa, depending on the mounting conditions.
The system also continuously checks the vacuum more than 300 times per second. If it detects a pressure drop, the pump can automatically activate again to restore the vacuum. LISEN says the system is designed to compensate for minor air leakage caused by vibration and temperature changes.
This is a clever solution to a common problem with suction mounts, but it also introduces more complexity. A conventional suction mount can work without electronics, while this one depends on its internal battery and pump to provide its main advantage.
20 N52 Neodymium Magnets
The mount uses 20 integrated N52 neodymium magnets arranged in a MagSafe-optimized loop. The magnetic connection eliminates the need for physical clamps around the phone, making it easy to attach and remove a compatible device.
For MagSafe-compatible phones and cases, the connection is straightforward. Phones without native MagSafe support can use the included magnetic ring.
The cradle-free design also keeps the sides of the phone exposed, which is useful for accessing buttons and avoiding interference with larger camera modules. However, magnetic mounting still depends on having a suitable magnetic connection on the phone or case.
Wide Phone Compatibility
The cradle-free magnetic design accommodates phones from around 4.0 to 7.2 inches without side clamps restricting the device’s width. Its 20 N52 neodymium magnets are rated to hold up to 1.5kg, making it suitable for larger flagship smartphones.MagSafe-compatible phones attach directly, while other devices can use the included magnetic ring. The actual experience can still vary depending on the phone, case, and placement of the magnetic ring.
Four-Axis Adjustment
The mount provides plenty of flexibility when positioning your phone, with its four-axis linkage offering 180 degrees of horizontal adjustment, 180 degrees of front-to-back adjustment, and 360 degrees of left-to-right rotation. This makes it easy to find a comfortable viewing angle regardless of where it is installed, while allowing the phone to be used in portrait or landscape orientation without moving the vacuum base.
The adjustment range is useful for navigation, although having more moving parts also means there is more hardware between the phone and the mounting surface than with a simple fixed magnetic mount.
Installing the Mount
Installation starts with choosing a suitable mounting surface. The vacuum system works best on smooth, flat, and non-porous surfaces capable of maintaining an airtight seal. Glass and other smooth surfaces are particularly suitable.
Once the surface is clean, position the mount and press the suction base against it. The automatic vacuum system then activates and creates the initial seal.
This is convenient, but it isn’t a universal solution for every dashboard. Heavily textured, porous, curved, or soft surfaces can make it difficult to establish the airtight seal the system needs. In those situations, a suitable mounting pad may be necessary.
That limitation is worth considering before buying, particularly if your vehicle has a heavily textured dashboard.
Automatic Pressure Top-Up
The auto-top-up system is where this design has an advantage over conventional suction mounts. Its pressure sensors continuously monitor the vacuum, checking it more than 300 times per second.If the system detects a pressure drop, the electronic pump can automatically activate to restore the vacuum. This is intended to compensate for small air leaks and changes caused by temperature and vibration.
The benefit is convenience because you don’t have to manually check the suction every time you drive. However, the system’s effectiveness still depends on the initial seal being good. Automatic re-suction cannot compensate for a mounting surface that is fundamentally unsuitable for a vacuum seal.
Easy Pressure Release
A physical pressure-release button on the side allows air back into the vacuum chamber, releasing the suction and making the mount easier to remove. This is particularly useful when repositioning it because you don’t have to pull directly against the vacuum seal. It also makes the mount reusable. You can release the vacuum, move it, and establish a new seal on another suitable surface.Reusable Vacuum Mount
Unlike a conventional adhesive mount, it can be removed and attached again without replacing an adhesive layer each time. This makes it useful if you occasionally want to change the mounting position.
Keeping the silicone suction area clean is important, however. Dust, lint, and oil can interfere with the seal and reduce the effectiveness of the vacuum system. The base can be cleaned with a damp cloth, but the electronic components and USB-C port should be kept dry.
The reusable design is a clear advantage, but it doesn’t mean every surface will work equally well. The quality of the vacuum seal remains dependent on the condition and material of the mounting surface.
Battery and Charging
It has a built-in 130mAh lithium battery that powers the electronic vacuum system. It charges through the USB-C port on the side and takes less than an hour to fully recharge.
LISEN rates the battery for around 20 to 30 days of operation on a full charge, depending on usage. An LED indicator also provides battery information, with a red light indicating that the battery needs to be recharged.
The battery life is reasonable for this type of system, but it is still another accessory that needs to be charged. If the battery runs out, you lose the electronic vacuum functionality until it is recharged.
That is an important difference compared with a traditional passive suction mount, which doesn’t depend on a battery.
No Wireless Charging
Despite using a MagSafe-compatible magnetic connection, it doesn’t provide wireless charging. The USB-C port is dedicated to charging the mount’s internal battery rather than charging the smartphone. If you want to keep your phone powered while using it for navigation, you’ll need a separate charging cable.This isn’t necessarily a deal-breaker, but it does mean the mount doesn’t replace a wireless charging holder if charging is one of your priorities.
Everyday Use
The LISEN A690 is easy to use once it has been installed on a suitable surface. Attaching a compatible phone takes only a moment, and removing it doesn’t require opening a clamp.The automatic vacuum system is the feature that requires the least user interaction. Once the mount has established its seal, it can monitor the pressure and activate the pump when necessary.
The adjustable mounting system also makes it easy to position the phone for navigation. However, the advantages come with more hardware and a battery that a simpler magnetic mount doesn’t need. For users who only want a basic phone holder, the additional vacuum technology may feel unnecessary.
What We Like
- Smart electronic vacuum system: Automatically creates and maintains the vacuum instead of relying entirely on a conventional suction mechanism.
- 300+ pressure checks per second: Continuously monitors the vacuum and can respond when pressure drops.
- Automatic top-up: The pump can restore the vacuum when minor pressure loss is detected.
- 20 N52 magnets: The MagSafe-optimized magnetic array provides a cradle-free way to mount compatible phones.
- Wide phone compatibility: The design accommodates phones from around 4.0 to 7.2 inches and is rated for up to 1.5kg of magnetic load.
- Flexible adjustment: The four-axis mechanism provides extensive positioning options.
- Reusable mounting: The vacuum system allows it to be removed and installed again without replacing an adhesive layer.
- Easy pressure release: The physical release button makes removing or repositioning it straightforward.
Things to Consider
The biggest limitation is its dependence on the mounting surface. The electronic vacuum system is designed to maintain a good seal, but it cannot overcome a surface that is too textured, porous, soft, or uneven.The electronic system also adds another point of maintenance. The 130mAh battery needs to be charged periodically, and the vacuum pump cannot operate normally when the battery is depleted. It is also more substantial than a basic magnetic holder because of the pump, battery, and additional hardware. If you prefer a minimalist setup, it may feel like more technology than you need.
Finally, there is no wireless charging. You’ll need a separate cable if you want to charge your phone while driving.
Final Thoughts
The LISEN A690 Electric Vacuum Magnetic Car Mount takes a more active approach to keeping a phone mount secured. The automatic vacuum system, magnetic attachment, and flexible adjustment make it convenient for everyday use.Its main limitations are the need for occasional charging and a suitable mounting surface. It also doesn’t include wireless charging. Overall, it is a good choice if you want a secure, reusable magnetic phone mount without relying on traditional clamps or permanent adhesive.
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