Don't let a low power supply hold you back with this helpful phone accessory. The power supply is designed to work with your existing Yealink phone, so you can keep it working effectively. Compatible with Yealink SIP-T21(P), SIP-T19(P), SIP-T23(p), W52P, W52H, SIP-T23G and SIP-T40P phones. Provides additional power to keep your phone system up and running. Backed by the manufacturer's 1-year limited warranty.