linptech wifi self-generation wireless bell power bell work for mijia app smart control memory function ac 110-240v

specifications: linptech label model wi-fi self-powered wireless ringtone polycarbonate material the color of white receptor voltage ac 110-240v the frequency is 433.92 mhz range 50 m (outside) transmission frequency 10 dbm the pressure energy is over 700g our plug transmitter size :67 67x19mm receiver :68 68 x31mm weight transmitter :43 g receiver :74 grams package including