Wireless Doorbell Transmitter PHYSEN Single Push Button for Home/Classroom Doorbell without Receiver (3 in, Black)

1.Specifications: Transmitter working voltage:?12V Working frequency: 433.92MHZ Wireless distance:1300 feet in open air Working temperature: -30?-70? 2.Notice: Please use high quality alkaline batteries, poor batteries will reduce the maximum operating range Please do not install transmitter on metal doors since metal is not easy to transmit the signal Pairing Instruction Our expandable wireless doorbell push button is freely match with receiver and vice versa. You can program each transmitter creates a different tone in the receiver or each receiver sets their tones separately. 1)Long press Back Control Button for about 10s until receiver "Ding" with LED flashes to clear receiver memory; 2)Press Forward/Back Control Button to switch required music for different transmitters; 3)After you choose the music, long press receiver Volume Button about 5-7 seconds until you can hear receiver "Ding" and the blue light will be flash. 4)Trigger the transmitter buttons to send a signal to the receiver. When you hear the ringtone you choose, which means that your operation is completed successfully. Then on this receiver to select another song for the back door and do the same way make it pair with a new one transmitter. 3.Product Include: 1*transmitter 1*screws&Anchors 1*screwdriver 1*double-sided adhesive tape 1*12V alkaline battery(Inside the button) 4.Warranty Promise: This units sold with 30 days money back and 1 year warranty from the date of purchase