Features: *1. It is compatible with all 12-volt(9-16V) vehicle batteries on 12-volt solar systems/RVs/motorcycles/boats/cars/trucks. *2. The battery load testing tells you everything about the battery, including voltage, charging, starting power, automatic detection of engine starting, etc. *3. Support Bluetooth 4.0 connective to transfer data to the phone via Bluetooth and enter the APP for real-time viewing. *4. The voltage of the car starting system and charging system can be monitored in real time, helping users to fully understand the data and characteristics of the car battery. *5. The intelligent chip will enter the protection mode and stop working when the voltage exceeds 20V or the product temperature exceeds 60 and back to the normal working status when they come back down. Description: *1. Model: BM300 *2. Working Voltage: 6V-18V *3. Working Temperature: -40 to 60 *4. Languages: Korean, Japanese, English, Czech, Spanish, Spanish, Italian, Romanian, Polish, Slovak, Russian, German, French Operation Method: *1. For Android: Phone settings - Bluetooth - Pair AERMOTOR. After successful pairing, enter the APP setting(the upper right corner), find AERMOTOR in the device management to connect, and test after successful connection. *2. For iOS: Make sure that the Bluetooth is turned on and go directly to the APP setting(upper right corner). Find AERMOTOR in the device management to connect, and test after successful connection. Package Includes: 1 x Car Battery Tester 1 x Manual Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.