International Wireless 6V/12V Battery & 12V/24V For 6V and 12V automotive batteries (SS EFB and AGM included) and 12V/24V charging/starting systems. Easy and fast Bluetooth pairing. Works with SBT1 SchulinkTM app, which includes eight language settings.. Performs Battery Test, System Test, Start-Stop Test and EV Battery Test. Email or text test results – stores 2,000 test records. Test batteries with as little as 1.5V. 3 LED indicators (Blue: Connected, Green: Power, Red: Trouble). On/Off button. 20-inch cable with durable clamps. 3.7V rechargeable internal lithium ion battery. Contents: (1) SBT1 tester (1) Manual SBT-1