DECT 6.0 Digital technology*Accessory handset only-requires a LS6425, LS6475, LS6426 or LS6476 series phone to operate*Caller ID/Call Waiting*-stores 50 calls*Push-to-Talk*HD Audio*Handset speakerphone*DSL Subscribers may need to us a DSL Filter*For optimal performance batteries should be charged for 16 hours prior to use