Feature:  

1.Use the industry's most stable music chip, load 36 chord ringtones, pleasant and wonderful.        

2.The adjustable 8-level volume can meet the needs of different environments.       

3.The doorbell has the function of power-off memory, which can remember the volume before power-off and the selected music. No need to worry about losing information.   

4.Low-power design, ultra-power-saving and durable use.  

    specification:    

                1: Working Voltage AC110-240V 

                2: Wireless Frequency 433MHz   

                3:Coding Mode 1527 / 330KΩ      

                4: Applicable Temperature -20℃ ~ +55℃

                5:Applicable Humidity 40% ~ 80%RH       

                6:Working Distance 100m (100m Open)