Additional Digital Cordless Handset compatible with Digital Cordless Phone Series KX-TGE21, KX- TGE23, KX-TGE24, KX-TGE26, & KX-TGE27. Accessory Handset does not work alone. Other Features include Speakerphone, Amplified Handset Volume with Dedicated Volume Key, Enhanced noise reduction and tone equalizer, Call waiting/caller ID with 50-phone-number memory, and hold and mute buttons.