Viking TBB-1B Talk Battery Booster - Enhanced CommunicationThe Viking TBB-1B Talk Battery Booster is a versatile device designed to enhance communication in various settings. With its advanced features and specifications, this product is perfect for use with line powered devices such as handsfree phones, touch tone hot-line dialers, digital announcers, and more.Product Features: Viking Electronics battery booster and current looper Compatible with touch tone dialing Power LED also displays activity Passes original ringing through to the device Passes caller ID data Passes hook switch flash Passes CPC signals Adapters and Connectors: Yes Color: White Specifications: Boost talk battery voltage up to 40VDC Boost talk battery loop current up to 26mA Power: 120VAC/12V DC 500mA UL listed adapter provided Dimensions: 76mm x 112mm x 36mm (3.0" x 4.4" x 1.4") Shipping Weight: 0.68 kg (1.5 lbs) Environmental: 0° C to 32° C (32° F to 90° F) with 5% to 95% non-condensing humidity Loop Current to Device: 26mA (nominal) Talk Battery Output: 40V DC (nominal) Connections: (4) screw terminals Learn More: Telephone Connector Caller ID Loop Current