Features: 1. Real-time display of battery health value, temperature, charge and voltage 2. Battery start system and charging system monitoring 3. Data abnormality alarm to remind you of battery status in time 4. Powered by solar panels, with Type-C charging interface, very low power consumption, one charge can be used for a week 5. 433MHz accurate transmission, real-time monitoring of battery status 6. Intelligent vibration induction, intelligent screen off and bright screen, automatic switch on and off, low power consumption 7. Patented algorithm, the longer the time, the more accurate. 8. Applicable to all 12V starter batteries, versatile, can be used in cars, trucks, yachts, motorcycles Specifications: BM5: Material: Plastic, ABS Working Voltage6-25V Working Temperature:-40°C-80°C Average Operating current: 2.3mA Data Transmission Frequency: 433MHz Wireless transmission Display:9 LEDS Protection: Built-in fuse and reverse polarity protection circuit BM5-D Head up Display: Built-in lithium battery capacity: 750mAh Charging input: solar panel, TypeC Display: Monochrome LCD screen with backlight Protection:Built-in fuse Operating temperature: -20°-70°C Storage temperature: -30°-80°C Package Include: 1 x head up display 1 x BM5 Battery Tester 1 x Instruction Manual