【SIMULTANEOUSLY MONITOR UP TO 4 OF 12V BATTERIES】 -- Download APP BM2, you can monitor 1 of 12v batteries. If you have more batteries, please Download APP BM3, you can simultaneously monitor up to 4 of these devices(APP BM2/FREE,APP BM3/ NOT FREE)

【FREE APP FOR BOTH IOS & ANDROID】 -- IOS: iOS 7.1 and Later Available: Android 4.3 and Later

【WIDER TEST RANGE】 -- Compatible with all 12-volt vehicle batteries,6-20V With Bluetooth 4.0.Small compact design, scan faster.Use fireproof and High Temperature-Resistant material

【RECEIVE NOTIFICATION OF AUTOMATICALLY】 -- App will send the battery status to the phone notification bar when enter Bluetooth range

【ANALYZE ANY 12V BATTERIES HEALTHY 】-- Tells you everything about the battery: voltage, charge,cranking power, Engine starting detect automatically, etc.