Uniden Loud and Clear Accessory Handset and Charger (EZX290) DECT 6.0 big button cordless phone with digital answering system Compatible with DECT 2000, DECT 2100, DECT 3000, and DECT 2900 series phones Used to expand Uniden DECT series phones up to six handsets Audio boost up to 20dB and adjustable audio tones Caller announce from handset