Specifications : Melodies: 38 Kinds Musical Tones and 16 chords for Selection Transmitter is Powered by: 1 x 12V 23A Battery (not Included) Remote Control / Receiver Distance: 50M Receiver Operating Voltage: DC 6V 50Hz/60Hz Volume: 25~ 75dB Power Consumption of Transmitter: ＜10mW Material: Plastic Color: White & Blue Weight: 8.64oz / 245g Consumed Power: 0.5W Operating Frequency: 315MHz±2MHz Model: VOYE Package Includes: 2 x Doorbell Receivers 1 x Transmitter