Welcome to our store！</br>1、Self Powered Doorbell: When the finger presses the doorbell, the kinetic energy is converted into electrical energy, 2pcs doorbell used for rear and front doors. 2、150m Range: The doorbell adopts 433MHz wireless signal, which has super penetrating power, and the receiving distance in open areas can reach 150m. 3、38 Melodies 3 Volumes: 38 melodies can be switched freely, the ringtones are pleasant to the ear, 3 volume adjustable, and mute can also be set. 4、Waterproof: The waterproof level of the transmitter reaches IP44, it can be installed outdoors and indoors, and is safe to use in rainy and foggy weather. 5、Nursing Pager: Not only a doorbell, but also a caregiver pager, suitable for the elderly, patients, pregnant women, guarding your family members. 6、Installation Method: Including strong double sided tape, no need for wiring and no damage to the wall, you can also use screws to install the doorbell. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text">Item Type:&nbsp;Battery&nbsp;Free&nbsp;Wireless&nbsp;Doorbell Material: ABS Working Voltage:&nbsp;AC&nbsp;100V-230V 50/60Hz Operating Frequency: 433.92MHz Standby Power Consumption: 0.25W Ringtones: 38 Volume: 3 Levels + Mute Controllable Volume: ≥50dB/1m Receiving Distance: ≥150m / 164yd&nbsp; (In Open Space) Receiver Working Temperature: -10℃-+45℃ Transmitter&nbsp;Operating Temperature: -20℃-+60℃ Receiver Size: Approx. 78x54x20mm / 3.1x2.1x0.8in Transmitter&nbsp;Size: Approx. 66x40x20mm / 2.6x1.6x0.8in Battery&nbsp;Free: The&nbsp;transmitter&nbsp;does not need a&nbsp;battery, it is self generated by pressing<style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 2 x&nbsp;Doorbell1 x Receiver 2 x Sticker Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>