This automobile battery monitor tool is suitable for the 12 V vehicle battery, with the function of data storage, connect with the smartphone APP through the BT and so on, it is useful in your daily routine or even your work. Come on and try it, it will not let you down. •Receive notification of battery conditions when entering BT range, which can save your time •It can check the vehicle cranking system automatically while engine is starting, and also check the recharging system •It also can list the time of each driving anf will alert your smartphone if some data abnormal, and also has the short-circuit and reverse connection protection •With the function of data stored in battery monitor up to 35 days if out of sync, and it will automatic synchronization when entering BT range •This battery monitor suitable for the 12 V vehicle batteries and you can review the historical data graphically Specifications: •Material: plastics •Average current: 1mA •Voltage accuracy: ±0.02V •Input voltage: 6~20V •BT name: battery monitor •Short-circuit protection: built in •Reverse connection protection: built in •BT: 4.0 •Operating temperature: -40℃~85℃ •APP keyword: BM2 •Available: Android 4.3 and Later •IOS: IOS 7.1 and Later •Item size: 55 x 35 x 15mm / 2.2 x 1.4 x 0.6in Package included: •1 x Battery Monitor