VTech 2421 2.4 GHz DSS Expandable Cordless Speakerphone with Caller ID (Silver/Black) 2.4 GHz Digital Spread Spectrum technology phone for enhanced range and signal clarity Expandable to 4 handsets Compatible with caller ID/call waiting Handset speakerphone and headset jack for hands-free operation Illuminated keypad for ease-of-use at night