Uses 9V battery, not included. Comes with ABN connector clips. Had Dual modular LED. Provides Continuity, external warble select, RJ11 & RJ45 socket, lanyard and short circuit LED/beeper. +10dBm output power (into 600 ohms) Output frequency (nominal=Alternating 890/960Hz, Warbling-slow 1.3 Hz/ Fast 6Hz.