Bluetooth Battery MonitorWhen you need a battery monitor but don't have space for the display or routing thecables would be a nightmare, there is now a solution. The BM-1(BT) will monitor yourboat or caravan's lead-acid batteries and transmit the data directly to your mobile phone,or tablet, wirelessly by bluetooth.A simple Android app, freely available from the nasamarine.com website or Google PlayStore, (requires Android V4.3 or later) shows your service battery voltage, current flowingin or out, state of charge and time to charge or discharge the battery. An audible alarmwarns if the battery level gets dangerously low. It will also show the starter batteryvoltage. For apple users a more sophisticated app, with additional features can bepurchased from the Apple app store. Compatible with iPhone, iPad and iPod touch.Offers Apple Watch App for iPhone. (Requires iOS 9.0 or later)The monitor, which draws a meagre 2 mA, is supplied with a 100 amp shunt and a premadecable assembly to simplify connection to your service battery.