Kastar AA/AAA Charger Bundle Pack for AA and AAA Rechargeable Batteries Kastar Mini AA/AAA Charger Features a Fold-out US Plug, 110-240V Worldwide Input Voltage. Charger indication Green lights for standby, Red is for charging. Which can prevent the overcharge and overdischarge. Charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock. The charger is for charging your AA Battery and AAA Battery. The Charger Include 30-DAY Money Back and 3-YEAR Manufacturer Warranty.