Panasonic KX-TGA271B Accessory Handset for KX-TG2700-Series Expandable Phones For KX-TG2700S, KX-TG2720S, KX-TG2730S, and KX-TG2740S expandable cordless systems 2.4 GHz frequency-hopping spread spectrum signal Digital-duplex speakerphone, headset jack, and belt clip 50-number memory for caller ID/call waiting 4-way conferencing, handset page, and intercom