Lithium battery converter with short circuit protection, overcurrent protection Description: Input voltage: DC 14-21 V. With short circuit protection, overcurrent protection, undervoltage protection Output voltage: USB 5 V interface, maximum output current 2A. DC socket interface, 12 V output voltage, maximum output current 5A. Battery level display function. is connected do battery, and the battery indicator lights up for about 5 seconds, then goes out. When the light is off, press the battery indicator button once, and the battery light will light up for about 5 seconds, then turn off. If the indicator light is still flashing, it indicates the battery. Fits do Decker 18V, 20V lithium battery. Specification: 1. They shine at the same time, and the battery power exceeds 80%. 2. Both lights light up at the same time and the battery level exceeds 50%. 3. The light is on and the battery level exceeds 20%. 4. flashes, battery level is %. 5. At the same time, the battery is worn out and stops working. Size Chart: Material: ABS Size: about 11x9x7 cm/4.33x3.54x2.76 inch The package includes: 1 piece battery converter