Wall-mountable corded base unit with large white backlit display; 1 Handset with backlit display and illuminated keypad for easy use. Base Unit Standby Power Consumption 0.7 W Automated Call Block requires unknown callers to press 1 to connect, screening out machine calls; use Telemarketing Call Block to require callers to say their names before you answer Answer incoming calls with Voice Command to talk on the speakerphone; 2-Way Recording button ensures you don't miss anything important Store up to 1000 numbers in the Call Block List; Talking Caller ID announces caller's name between rings using text-to-speech technology so you hear who is calling Noise Reduction automatically suppresses background interference while enhancing voice tones so you can easily hear conversations 2 AAA Rechargeable - Ni-MH Batteries Included. Please find more information regarding batteries in Page Number 4 of the User Manual provided below in this page.