Panasonic KX-TGA939T DECT 6.0 Cordless Handset Handset is designed for use with Panasonic DECT 6.0 Two-Line Expandable Phone System (KX-TG9392T). Handset offers Caller ID, two phone lines, a 1.9GHz frequency, backlit keypad, three-line LCD, three-step talk volume, six-step speakerphone volume, headset jack, 10-number redial memory, intercom, three-way conference calls, and 100-name/number memory. Night mode allows you to program the handset to ring or remain silent for specified time period without affecting other handsets. Battery life lasts 12 hours of talking and six days in standby mode.