AT&T 2300 Accessory Cordless Handset, Black/Gray | Requires an AT&T 2320, 2325, 2355, or 2365 Expandable Phone System to Operate For use with your current AT&T 2320, 2325, 2355, or 2365 system 2.4 GHz DSS with frequency hopping technology Last-5-number redial; 2-way page and intercom Caller ID/call waiting capability with 90-call memory Speakerphone for hands-free conversations