Additional Details ------------------------------ Product description: - 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