52 ring tones 300m range in the open air 4 level volume,adjustable LED indicator for receiver For family commercial residential area,office building,hospital,restaurant,factory. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Type: Doorbells Ringtones:52 pcs Colour: Black Material: ABS : Electrical Doorbell Type: Wireless Power Source: AC,Battery Power supply: AC100-240V Working frequency: 433MHZ Ring Tone: 52 ring tones Waterproof : yes Volume:4 files 10-110db Battery mode: 12v 23A battery (not include battery) Receiving distance: 300M Remote (in open area) Suitable for: Home,office,villa,hospital,school,factory The transmitter 12V23A pre-installed (not include battery) The use of microprocessor control, double-sided PCB micro-power design. The frequency of 433MHz, can be customized other frequencie. Touch the button configuration, superheterodyne learning code on the code mode Double-sided stability of the PCB, the chip standby sleep up to micro-level. Package List: 1x Receiver 1x Transmitter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.