UpBright 9V AC/DC Adapter Compatible with Rockville ROCKBOX PRO ROCKBOXPRO Rechargeable Battery 6.5" 150W Portable LED Karaoke Machine System Party Bluetooth Speaker 9VDC Power Supply Cord Charger PSU - Rockville ROCKBOX PRO 9V Power Supply

• 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. UpBright 30 days Refund. 24 Months Exchange. UpBright New Global 9V AC / DC Adapter Compatible with Rockville Model: ROCKBOX PRO ROCKBOXPRO 7.4V DC7.4V 7.4 Volt 7.4 Volts 7.4VDC Lithium ion Li-ion Liion Rechargeable Battery Pack 6.5" 6.5 Inch 150W 150 Watts Portable LED Karaoke Machine System Party Bluetooth Speaker DC9V 9.0V 9VDC 9.0VDC 9 V 9.0 VDC Class 2 Switching Power Supply Cord Cable PS Wall Home 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.