bitiwend wireless doorbell kit,door bell operating at 1000 feet with 58 chimes,5 level volume, 3 receivers & 2 weatherproof push buttons with sound and led flash,low power consumption bitiwend <b>bitiwend wireless doorbells are expandable and add more receivers and transmitters including accessories like door and motion sensor.</b><br> one doorbell receiver can work with 20 transmitters at most and each transmitter can be set to different or same chime/music.<br> <br> <b>specifications:</b><br> maximum 1000ft /300m operating range in open area<br> transmitter battery: a23 12v alkaline battery<br> transmitter power consumption: <10mw<br> volume range: 25 to 110db<br> operating temperature: 5°f to 140°f or -15°c to 60°c<br> dimension: receiver: 3.17 x 3.19 x 1.12in<br> <br> <b>how to pair</b><br> please make pairng before installtion.<br> <br> 1. pull out the strip on the door sensor part and plug the receiver into outlet.<br> 2. press the forward or backward button to select the rintone you want.<br> 3. after choosen the ringtone,then long press receiver volume button for about 5-7 seconds until hear receiver “ding” with blue led light flashes which mean receiver get into pairing mode and it will exit it automatically if it doesn’t get signal from transmitter in 5 seconds.<br> 4.when receiver get into pairing mode,you should immediately press the push button to pair with the receiver in 5 seconds.you will hear the tone you selected which mean your operation is successfully.<br> <br> if you still have questions of pairing, please contact with our customer service team to get video.<br> <br> <b>package list:</b><br> 2*transmitter<br> 3*receivers<br> 2*screws&anchors<br> 1*screwdriver<br> 2*double-sided adhesive tape<br> 1*user manual<br> 2*12v23a alkaline battery(included in the push button)<br> <br> <b>note:warranty promise:</b><br> this units sold with 30 days money back and 1 year warranty from the date of purchase.<br> <br>