Voltage of Plug-In Smart Receiver: AC 110V ~ AC 220V 50Hz/60Hz

Battery in Transmitter: 12V 23A Alkaline Battery

Power Consumption (Transmitter): < 10mW

Wireless Range: 900 ft in Open Air; 100~500 ft w/ Metal Security doors and Walls

Selectable Ring Tone: 52 Options

Volume Range: 4 Levels (up to 110 dB)

Expandable to Multiple Smart Receiver or Transmitter: Up to 50

Working Frequency: 433.92 MHz±280KHz

Working Temperature: -30℃~70℃

Plug type:AU,US,EU,UK optional