World Wide Input Voltage 100-240VAC 50/60Hz OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection) Tested Units. In Great Working Condition. Kircuit New Global 2-Prong AC / DC Adapter Compatible with HISION Model A7 Max A7Max A7 MAX-GY A7MAXGY 21.9V 7800mAh 170.82Wh DC21.9V 7.8Ah 21.9 Volt 7800 mAh 21.9 Volts 7.8 Ah 21.9VDC Lithium ion Li-ion Liion Rechargeable Battery Pack SAT-3P6S SAT3P6S 180W Powerful Suction Swimming Robot Cleaner Cordless Robotic Automatic Pool Vacuum Class 2 Switching Power Supply Cord Cable PS Charger Mains PSU (w/ 2-pin Connector) (Note: !!! 21.9V is Pool Cleaner's battery voltage. !!! NOT charger's voltage. Please Check For Compatibility With Your Unit. Thanks.) !!!Tips: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working. Compatible with listing item ASIN: B0D2DJZGRZ -- Pool Vacuum for Inground Pools: HISION Cordless Automatic Pool Cleaners Robotic for Swimming Pool Wall and Waterline Cleaning with 150 Mins Long Battery 180W Suction for Pools up to 2000 Sq.ft Kircuit AC adapters are tested and designed to meet the power needs of your device. This adapter converts AC power into the DC power required by your device. This supply allows you to operate your device or charge its battery from electrical power outlets. Kircuit Adapters are a portable power source for when your on the go, at home or office. This adapter has been validated and tested to ensure it will work with your device.