Panasonic KX-TGA651B DECT 6.0 Three Pack Handset Bundle for DECT 6500 Phones Expandable - Up to 6, Channel - 60, Calendar, Volume Control, Speakerphone, Redial - 5-history, Intercom, Conference Call - Up to 4-Way. Compatible Devices: Panasonic Cordless Phone Frequency Band/Bandwidth: 1900 MHz Battery Talk Time: 13 Hour Battery Standby Time: 2 Week