Alarm RL-3977MP3

Wireless door chime function with a frequency of 433MHz or 315MHz.Remote control distance is 100m.Receiver is enclosed with 1200mA lithium battery and charger, saving the trouble of frequent battery replacement.Remote control is enclosed with batteries with about 2-year lifespan.Choose favorite music from MP3 as ring tone.Remote control meets IP44 waterproof and dustproof standards.Advanced learning code technology and digital transmission signal to prevent interference.