If you ever wanted an inexpensive and accurate way to test your battery voltage, log the usage and something that extremely easy to install then this is the tool for you. Check your parked up boat or caravan batteries without going outside, app can monitor multiple batteries (individual bluetooth modules required), receive notifications once a day on the condition (toggle on or off), use the log to determine a failing battery, especially handy if you have two installed and cant identify the issue.
Features

• Receive notification of battery conditions when enter Bluetooth range
• Check vehicle cranking system automatically while engine is starting
• Check charging system (alternator)
• List the time of each driving
• Alert mobile phone if some data abnormal
• Short-circuit and reverse connection protection
• Data stored in battery monitor up to 35 days if out of sync
• Automatic synchronization when enter Bluetooth range
• Compatible with all 12-volt vehicle batteries (do not suit Lithium batteries)
• Review historical data graphically