Handsfree Talk-Back Paging Amplifier. The HF-3W handsfree paging unit allows employees to respond to a paging message without reaching for the telephone. It is perfect for use in city desks, shipping and service applications where quick answers are needed. The HF-3W generates its own talk battery and will interface with unused trunk ports on PABX s and key systems, and single line phones, as well as some telephone systems with a two-way paging port and a contact closure. Simply page the intended employee with a question and they can respond by speaking toward the paging horn. Paging and talk-back volume sensitivity controls are provided. Applications City Desks Shipping Docks Manufacturing Plants Service Counters Warehouses Schools Parts Departments Features Improved audio circuitry Alert tone Selectable Push-to-Talk feature for noisy environments 28V DC talk battery 3 watts of paging power Compatible with some two-way paging ports Background music input May be integrated into existing paging system (1) 25AE paging horn included 25-50 foot talk-back range Optional second speaker may be added 1 year warranty Made in the USA.