"Original Yealink power supply unitInput: 100 - 240 V ~ 50/60 HzVoltage: 5 VCurrent rating: 600 mACompatible with:Yealink SIP-T19P E2Yealink SIP-T21P E2Yealink SIP-T23GYealink SIP-T40PYealink SIP-W52PYealink SIP-W56P"