Useful when you are in the garden, terrace, garage or bathroom, you can also take as a bell inside (for the elderly, sick, etc. ..): The receiver will be active even at 20 feet away. 8 melodies and 64 selectable frequency codes to avoid creating interference. Dual internal speaker by 29mm to ensure a sound selectable between "HIGH" - "Medium" and "Low". Any type of electrical installation, the receiver connects directly into household 220V, while the transmitter uses a battery (not included) 12V 23. Transmitter port plate. Supplied in blister. Color: White / transparent blue Transmitter dimensions: 120 X 60 X 40mm