Viking Electronics HF-3W Handsfree Talkback Features Improved audio circuitry with alert tone Selectable "Push-to-Talk" feature for noisy environments 25-50 foot talk-back range 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, 2 speakers maximum Maximum Speaker Run: 152 m (500 ft) maximum, 18 AWG Made in the USA with a 1 year warranty Specifications Power: 120V AC/13.8V AC 1.25A, UL listed adapter provided Dimensions: 133mm x 89mm x 44mm (5.25" x 3.5" x 1.75") Shipping Weight: 1.36 kg (3 lbs.) Environmental: 0 C to 32 C (32 F to 90 F) with 5% to 95% non-condensing humidity Connections: 10 pin screw terminal stripRJ-14 type multimodule interconnect