This set includes 1 piece of door bell receiver, 1 piece of remote control(transmitter).Door receiver can be plugged into an electrical outlet in your home.Remote control range can be up to 100meters. Plug in and use-no set up required. One remote doorbell button, one plug-in doorbells with 36 polyphony sounds.Loud enough to hear at any of the 4 levels of volume and low enough so it won't disturb any sleeping children.Product Descriptions:This wireless doorbell kit is easy and convenient to use. It do not need to change batteries and arrange any wires for installation. The transmitter has many characteristics, such as durable to use, waterproof, high-temperature and low-temperature resistant. It has 36 ring tones for you to choose and has low crosstalk rate.Easy to install with the double side adhesive tape and the screws.You can install the doorbells in locations, such as kitchen, back yard, bedroom, etc.Specifications:Working voltage: 200-240VWorking current: 120mAPower: 2WPower charger: EU plug/US lug Music: 36 music for optionSound: 25-80dB (4 grade volumes)Remote control distance: 100m (in open air)Work voltage: 12V (Battery Model: 23A 12V, not included)Work current: 15mA(20 times a day by calculating, a high quality)LED indicator: press the send button, LED indicator light will flash, emitter work and the receiver receive the order and then send out the beautiful music reminded you the VIP visit, the blue-ray LED of the receiver will regular flash along with the musicTemperature: -10 -50 Product dimensions:Receiver: 9.5 * 6.0 * 3.4cm/3.7*2.4*1.3inTransmitter: 8.4 * 6 * 2.3cm/3.3*2.4*0.9inReceiver: 72gTransmitter: 37gPackage List:1 * Wireless Electronic Doorbell Receiver1 * Transmitter2 * screws1 * User Manual(English) Customer service online time?Beijing time 9:00-18:00 (except weekends and statutory holidays)If you have any questions, please feel free to contact us. We will reply to you as soon as we see it.