Check the listing for details. Viking Boosts Talk Battery Booster & Current Looper Line Powered Devices TBB-1B. Color: White, Condition: New. Listed at 92.05 USD. Brand New Sealed in Manufacturer's Packaging Viking Talk Battery Booster Purchase by 4pm CST M-F and this Viking Talk Battery Booster Ships out SAME DAY Normal 0 false false false EN-US X-NONE X-NONE Viking Electronics battery booster and current looper to line powered devicesRun line powered devices such as handsfree phones, touch tone hot-line dialers, digital announcers, etc.Increase maximum loop length on analog PABX/KSU stationsUse with wireless doorbox devicesBoost talk battery voltage up to 40VDCBoost talk battery loop current up to 26mAPower LED also displays activityPasses original ringing through to the devicePasses caller ID dataPasses hook switch flashPasses CPC signalsPower adapter includedCompatible with touch tone dialingNote: Not compatible with pulse/rotary dialingPower: 120VAC/12V DC 500mA, UL listed adapter providedDimensions: 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 humidityLoop Current to Device: 26mA (nominal)Talk Battery Output: 40V DC (nominal)Connections: (4) screw terminals