1. Kinetic Battery free transmitter . 

2. Plug in receiver with night light function .

3.Operating Range: 200M in open air

4. 64melodies for choosen ;

5. 4-Level Volume Control(25dB-100dB)

6.  LED Indicator 

7. Waterproof Push Button

8. Auto Learning code, easy to DIY but no interference .

9.one receiver can pair with 8 transmitters , one transmitter can pair many receivers ,no limited .