Applications Run line powered devices such as handsfree phones, hot-line dialers, digital announcers, etc. Increase maximum loop length on analog PABX/KSU stations Use with wireless doorbox devices Features Modular connections for easy installation Boosts talk battery voltage and loop current Use with optional higher voltage adapter to gain even more talk battery voltage Automatic polarity correction during installation Specifications Power: 120VAC/12VDC 500mA, UL listed adapter provided or up to 30VAC/40VDC Dimensions: 120mm x 70mm x 35mm (4.75" x 2.75" x 1.38") Environmental: 0 degC to 32 degC (32 degF to 90 degF) with 5% to 95% non-condensing humidity Connections: (2) RJ-11 jacks