American Telecom&reg; UA20224B 2.4GHz Dual-Handset Expandable Cordless Phone With Caller ID/Call Waiting, Black Dual-Handset Expandable Cordless Phone Caller ID/Call Waiting frequency 2.4 GHz w/ 50 numbers caller ID log memory capacity talk time: 10 hours; standby time: 4.25 days; type of display LCD 20 numbers speed dial phone book capacity; Multi-language support