What's in the box:

Wireless Doorbell Kit 2PCS Outdoor Doorbell + 1PCS Indoor Chime With LED 5 Levels Volume 58 Ringtones 328ft Operation Range Outdoor Waterproof Door Bell (White)

Overview:
This doorbell comes with a transmitter and a receiver. When a visitor presses the doorbell, loud sound is activated to remind you to open the door. You will never miss a visitor. It can make your life easier and smarter. Ultra-low power consumption, it's your cost effective choice.

Features:
*The chime is easy to pair with the doorbell hub, easy for installation.Outdoor doorbell button with anti-tamper alarm function.
*Indoor doorbell hub is plug and play, no need batteries, low power consumption.
*Chose what you like, 58 melodies optional, and 5 levels volume adjustment.
*433MHzwirelessfrequency,328ft/100m wireless working range in open area.
*Rainproof: Doorbell can be installed outdoors, do not worry about being drenched by rain.

Hub Specifications:
Power Supply: 110/220VAC
Backup Battery: 3.7V, 300mAh Lithium Battery(included)
Consumption: <100MA> Radio Frequency: 433Mhz
Selectable Melodies: 58 Volume
Levels: 5(includes mute)
Sound Level(typical): 85dBA
Expandable: up to 100 doorbell buttons/sensors and 10 remote tags
Plug: EU-Plug, US-Plug, UK-Plug (optional)
Item Size: 92*57*48mm / 3.6*2.2*1.9in
Operation Temperature: -10-55?
Doorbell Button Specifications:
Power Supply: DC 3V 1* CR2032 Lithium Battery(included)
Standby Current: <5uA> Transmitting Distance: 100m/328ft (Without obstacles and no Interference)
Radio Frequency: 433Mhz
Item Size: 68*43*17mm / 2.7*1.7*0.7in
Operation Temperature: -10-55?

Package Information:
Package Size: 11.6 * 8.3 * 6cm / 4.6 * 3.3 * 2.4in
Package Weight: 167g / 5.9oz

Package List:
1 * Inside Receiver(UK)
2 * Outdoor Transmitter
2 * Sticker
1 * User Manual(English)