wireless doorbell, boying waterproof door bell with 38 melodies and led flash,1000-foot range, 4 level volume, 1 button & 2 receivers, white bo ying <b>this product comes with one button and two plug-in chimes, making it a great solution for two-story homes. you can hear someone ring the doorbell, no matter where you are.<br> one of the most cost-effective, popular dual-receiver wireless doorbells is the bo ying door chime kit.</b><br><br><b>common problems and troubleshooting</b><br><b>the receiver suddenly can't get signal from transmitter and doesn't ring.</b><br>reason 1: reset the receiver by accident so that transmitter is not paired with receiver any more.<br>solution 1: re-pair receiver with transmitter by these steps:<br>1plug in receiver and press the chime tune button ( top) of the receiver to select a tune that you like.<br>2then press the volume button of the receiver for 5 seconds and hold it, it enters the pairing mode.<br>3then press the transmitter until it rings the selected tune.<br>reason 2: low-power battery in transmitter. the less power in transmitter, the shorter range is.<br>solution 2: replace with a new battery.<br><b>please note:</b><br> 1. do not unplug the receiver during pairing transmitter.<br>2. when you hold the volume button(the lower one) of the receiver, not just 5 seconds, you can try more than 5 seconds and press the button repeatedly, until the receiver match with the button to ring.<br>if you have any other concerns or are not satisfied in any regard, please feel free to contact us firstly. we will try our best to solve your problem. thanks!</b><br><br><b>specifications</b><br>wireless range: 1000ft maximum in the open air<br>internal sounds: 38 chimes<br>volume: 4 level adjustable levels (25db to 85db)<br>receiver power: ac 110v ~ 220v 50hz / 60hz<br>transmitter power: 1 x 12v 23a battery<br><br><b>package includes</b><br>1 x push button (transmitter)<br>2 x plugin chime (receiver)<br>2 x screws<br>1 x screwdriver<br>1 x double-sided adhesive tape<br>1 x 12v 23a battery for transmitter<br>1 x user manual<br>