Wireless Doorbell Welcome Friend Smart Doorbell 300Meters Long Distance 36 Songs 4 Level Volumes Door Chimes Battery Version

Wireless Doorbell Welcome Friend Smart Doorbell 300Meters Long Distance 36 Songs 4 Level Volumes Door Chimes Battery VersionFeatures and specifications:1.The button supports up to 20PCS, and the receiver supports up to 100pcs.2. Power-off memory function: Turn the power on again after power off, no need to re-adjust and lock the ringtone.3. The transmitter has no screw chuck design, and it can be waterproof and dustproof without rubber ring.4.The transmitter USE a 23A12V alkaline battery (not included battery,Need to buy separately).5.The receiver is powered by a battery, which is very convenient to use.6.Receiving distance:300 meters in open area.7.The wireless signal will be affected by obstacles. The more obstacles, the more serious the signal loss.8.Receiver has 5 levels(can be mute) 0-110db,36 music to choose from.9.Size:Transmitter 755120mm,Receiver 956524mm.NOTE:The button cannot be placed on an iron door because it will interfere with the signal.How to pair signals?1.Pairing method: press and hold the volume button on the receiver for about 5 seconds (the light is on), release the volume button, then press the button immediately, the signal is successfully paired.How to modify and lock music?Press and hold the volume button of the receiver before plugging in the power socket. Plug in the power socket until the light of the receiver lights up, release the volume button, press the music button to adjust to the favorite music ringtone, press and hold the volume button again until When the light is on, press the transmitter twice immediately and the music is locked successfully.