ไฟแสดงสถานะแบตเตอรี่ 12V 21V ขาหลอดยาว

1. Onboard high-precision voltage detection chip and power supply regulator chip 2, onboard 4-digit power indicator LED light, divided into 3 colors, red, yellow, yellow, green represent 20%, 50%, 80%, 100% of electricity 3. Reserve one battery detectio