BM2 Battery Tester Bluetooth-Compatible 4.0 BLE Battery Diagnostic Tool 12V Charging Cranking Voltage Test for IOS Android Phone Feature:1. Simple to Use:This car battery monitor is easy to use. Simply install the device and check the battery status on your smart phone via Bluetooth-compatible 4.0. It eliminates the need for complicated setups and provides a user-friendly experience.2. Wide Compatibility:Suitable for all 12V vehicle batteries, this battery tester has broad compatibility, making it ideal for a wide range of vehicles. Whether you have a camper van, recreational vehicle, or daily driver, this monitor can be used to keep track of your battery's health.3. Real-time Alerts and Notifications:When within Bluetooth-compatible range, your smartphone will receive alerts and notifications about the battery's condition. Stay informed about potential iues or low battery levels, ensuring you never get caught off guard by a dead battery.4. Monitor Up to 4 Batteries:This battery diagnostic tool allows you to monitor up to four batteries simultaneously. This feature is particularly useful for those with multiple batteries in their camping vehicles or other applications where multiple batteries are used.5.