GE 21920FE1 True Digital Accessory Cordless Phone with Caller ID. True Digital accessory handset can be used only with Multihandset 21900 & 21905 series. Call Waiting; 50-number memory; 40 name and number Caller ID Hearing aid compatible - allows people with hearing aids to use the phone Trilingual voice prompts; room monitor Dect 6.0 Technology. Accessory handset only; does not operate indepently.