The product advantages are as follows:
1. Model: single slot, 3 slots, and 4 slots usb battery chargers for different users
2. Overcharge protection, overvoltage protection, overput protection, overcurrent protection, over temperature protection, short circuit protection, reverse connection protection, over discharge protection on these USB chargers.
3. Applicable battery: 18650/26650/14500/16340/10400/16650/14650/18350/18500/10440 lithium batteries.
4. Multi slot independent charging, can be mixed charging.
5. With PC+ABS fireproof shell
6. USB charging, so you can use on the computer, car, etc.
7. Red means charging, and green means charged or no battery.