Product SKU:Color/finish:Red Frequency:433.92 MHz Digital Wireless doorbell receiver with one battery-operated transmitter Receiver with LED flashing indicator 3 Volume level (high/mid/low) with 25 selectable polyphonic tunes Adjust the volume as per required sound level Remote(Transmitter)range up to 100 m in open air Offers usage in multiple applications for both residential and commercial work spaces Transmitter operated by one pc 12V 23A battery(included) Weatherproof transmitter With learning Code-For connecting multiple receivers with single transmitter and vice versa Tango Digital Wireless Doorbell