- Viking Electronics battery booster and current looper to line powered devices- Run line powered devices such as handsfree phones touch tone hot-line dialers digital announcers etc.- Increase maximum loop length on analog PABX/KSU stations- Use with wireless doorbox devices - Boost talk battery voltage up to 40VDC- Boost talk battery loop current up to 26mA- Power LED also displays activity- Passes original ringing through to the device- Passes caller ID data- Passes hook switch flash- Passes CPC signals- Power adapter included- Compatible with touch tone dialing- Note: Not compatible with pulse/rotary dialing- 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 VKTBB1B