s: This set includes 1 piece of doorbell receiver and 1 piece of remote control(transmitter). Usage: Step 1: Plug the receiver into the 5V adapter and plug in the power supply. Step 2: Press and hold the volume button for 5 seconds, the LED lights up long. Step 3: Press the remote control button, the receiver LED goes off once and then back to long light. Pairing is successful! You can start to use it. Features: 1. Remote control range can be up to 150 meters. Plug and play. 2. 30-song Ringtones: SOS Button Doorbell has 30 song ringtones to choose from, and you can choose your favorite music. Loud enough to hear at any of the 3 levels of volume and low enough so it won't disturb any sleeping children. 3. High performance: Smart USB Doorbell has ultra-low power consumption, long service life, and a working temperature range of - 20-70 , which can withstand various adverse weather conditions. 4. Modern and Practical Design: Our Wireless Doorbell has a fashionable appearance and practical functions. Lightweight and sensitive, it can be remotely controlled, providing you with quick instructions to ensure that you hear the bell and open the door in a timely manner. You can install the doorbells in locations, such as the kitchen, backyard, bedroom, etc. 5. Easy to Install: The Mini Door Bell is easy to install and can be installed in just a few minutes. The receiver can be placed with screws. This wireless doorbell kit is easy and convenient to use. Door receiver plugged into an electrical outlet in your home. 6. Precautions: In environments with high wireless interference, the transmission distance of the Wireless Doorbell Receiver may be reduced. If no music sounds, check whether the horn wiring is disconnected. Doorbell receiver: Product name: Wireless doorbell receiver Music Quantity: 30 pieces Output mode; horn Demodulation method: ASK Shell material: ABS Control method: equipped with remote control Product size: 56.5 * 33 * 5.3mm/2.2*1.2*0.2in(excluding housing) Product weight: 8g (without housing, including speaker) Working voltage: DC5V/1A Standby current: 4.6mA Working current: 120mA Receiving sensitivity: - 105dB Working temperature: - 20-70 Product type: Smart Doorbells Label: Yes Single button remote control(DoorBell): Product Name: Single Button Remote Control Operating frequency: 433.92MHz Battery type: button battery 2016 * 3 Modulation mode: ASK Encoding format: EV1527 Shell material: ABS Product size: 45 * 45 * 14mm/1.7*1.7*0.5in (including housing) Net weight of the product: 11g (including shell and battery) Working voltage: DC9V Quiescent current: 0.1uA Emission current: 20mA Transmission power:+10-13dBm Working temperature: - 20-70 Package includes: 1 x Wireless Doorbell Receiver 1 x Single Button Remote Control(with battery) 1 x User Manual