Wireless Doorbell Household Intelligent Ultra Long Range Remote Control Doorbell USB Powered Call Reminder,Wireless Smart Door BellFeatureStrong signal,long-distance reception,able to penetrate 3-4 walls,with an open distance range of up to 150 meters.In open areas,it is very suitable for large houses,including villas,apartments,offices,shops,warehouses,etc38 chords can be Freel switched,selecting a unique ringtone that is different from the neighbor's,not afraid of hearing the wrong sound,and having a lot of in life.The doorbell does not cross talk 3 speed Adjust volume,can be heard on balconies,kitchens,or even in the bedroom,making it convenient for family members to use 3 speed Adjust volume,and the sound level can be adjusted according to their preferences Multiple buttons,setting different ringtones.The host can be equipped with multiple buttons,corresponding to different positions.The receiver can set different ringtones to distinguish between front and rear doors,which music sounds,and where the visitor is located It is a doorbell,but it's also a pager.When the elderly,infants,and pregnant women need to sleep alone,they can tell with just a click.The Dingdong machine is into the power bank and can be at any time Product parameters: Product name: Wireless doorbellMaterial: ABSColor: WhiteWorking voltage: 5V (USB power supply)Power consumption: 0.25WWorking frequency: 433.92 MHZWorking temperature: -10 -45 Controllable volume: 50db/1mRemote control distance: 150mTransmission power: 10mwPackage size:11x8.7x3.1cm/ 4.33x3.43x1.22 inchGross weight:60g/ 0.13 lbThe Package Include:1 x Doorbell1 x Dingdong machine1 x Installation tool