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. eeTao 30 days Refund. 24 Months Exchange. eeTao 12V 1A AC/DC Adapter Replacement Charger Replacement Compatible with ROPVACNIC A1 Robot Vacuum Cleaner 7.4V Rechargeable Lithium-ion Battery Charger Mains PSU ⚠️!!!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. eeTao 30 days Refund. 24 Months Exchange. eeTao 12V 1A AC/DC Adapter Replacement Charger Replacement Compatible with ROPVACNIC A1 Robot Vacuum Cleaner 7.4V Rechargeable Lithium-ion Battery Charger Mains PSU CECCCROHS 100-240