The Talking Caller ID Unit, model ats4403tg, is voice output caller identification unit designed for use by individuals who are blind or have low vision. This unit announces the caller's name from the caller ID record. No set up is required for this plug and play unit. It has separate RJ11 telephone and line jacks, and it connects to any phone jack. Multiple stations can be used for clear coverage throughout the user's home, and each unit has volume control. The unit is built to BellCore specifications and is Centrex compatible. POWER: Uses 3 AA batteries (included) or AC adaptor (not included). COLOR: Gray.