Hi, Dear little angel, welcome to Jacenvly, our products are cheap and good quality, price is fair, you can't miss it. If this product is not your style, please click on our store, we have many kinds of products, there will be you like and suits you. If you have any questions about your purchase, please send us the first message, we offer world class customer service to make your purchase without your worries. Have a nice day. USB Doorbell Voice Intelligent Home Wireless Remote Control Remote Electronic Music Doorbell Feature: Product name: USB doorbell Material: ABS Type: wireless doorbell Receiver plug type:USB volume level:4 Battery type：CR2032 Battery Ringtones:20 Description: 150 metre wireless range: With a reliable wireless range of 150 metres for one-to-one pairing, the Plug-In Door Chime has a strong signal penetration to ensure that you don't have visitors, even if you're several rooms away or on another floor. IP44 waterproof: Multifunctional remote control doorbell, IP44 waterproof and wireless doorbell chime. Withstands various harsh weather conditions, doorbell wireless can be used for home, offices, hotels, garages, shops, apartments, villas, gardens, hospitals and schools. 20 melodious ring tones: The receiver doorbell has 20 tunes and multiple volume adjustment meters Easy to install: The doorbell is easy to install, just plug the plug-in doorbell receiver into the socket and then fix the outdoor remote doorbell transmitter to the wall with the supplied accessories. Memory function: Remembers your last melody and volume level a power outage Package Included: 1 x Doorbell 2x Ding Dong Machine 1 x Instruction manual Feature: Product name: USB doorbell Material: ABS Type: wireless doorbell Receiver plug type:USB volume level:4 Battery type：CR2032 Battery