1. APPLICATIONS: The B3 20W 1600mAh balance charger is specially designed for 2S and 3S lithium polymer batteries. Do not use it for Liion batteries. 2. SPECIFICATIONS: Input voltage: 100240V AC; Charging current: 1.6A; Power: 20W; Display: 3 x bicolor LEDs. Do not charge 2S and 3S batteries simultaneously. 3. SUPER SAFE: The B3 Pro balance charger features quality chips and materials, with builtin reverse polarity protection, short circuit protection, overcharge protection, overcurrent protection, and overtemperature protection. Use it with complete confidence. 4. EASY TO OPERATE: Connect the charger to powerthe LEDs will change from red to green. Connect the battery packthe LEDs will turn red, indicating charging. When the LEDs turn green, charging is complete. Remember to unplug the charger and turn off the power.