What's in the box:

SONOFF SNZB-01 Wireless Switch for Electronics Battery-powered Smart Light Switch App Controlled Home Automation Timer Switch for Whole House Fan Outdoor Lights Compatible with ZigBee IFTT Wi-Fi Devices (Standard)

Simplify smart control of home with one button. The device can work with other gateways supporting ZigBee 3.0 wireless protocol. Applied for controlling whole house's electronics, fans, lights, humidifiers, etc.

Features:
[Home Automation] Control devices from any corner of your home. A mini and exquisite ZigBee wireless smart switch replying on SONOFF ZigBee Bridge that allows you to reach the purpose of scene linkages between ZigBee devices and Wi-Fi devices.
[Customized Button Actions] Customize button actions in the APP. The button switch is customizable with three control options - single, double press and long press, so you can, pretty easily, program routines and actions as simple as you require.
[Smart Scenes] Set a smart scene to make it communicate with Wi-Fi devices. The brilliance of the button lines in its flexible movability, you can strategically place it or move it around your house to where it will be most helpful, then create a smart scene to make it work for you based on different button actions that you customized.
[Two-way Control of the Light] Two-way control is even available for you to turn on/off the light from two locations. Connect the button with SONOFF smart wall switches and you can turn off the light downstairs after going upstairs.
[One-tap Pairing] Pair with all devices with a single tap. It's so much easier to pair it with multiple connected devices that you want to manage, just tap on the APP to get all devices paired.
[Low-battery Notification] The button is battery-operated that your mobile phone will receive a low-battery notification when the remaining battery level is less than 10%, maybe it's time to change the battery.

Note:
*ZigBee Bridge is required, and it is sold seperately.
*Does not compatible with Alexa and Google Home.
*Maximum effective distance within 80 meters from the SONOFF ZBBridge or intermediate router.

Specifications:
Brand: SONOFF
Model: SNZB-01
Material: PC
Battery Model: CR2450 (3V)
Wireless Connection: ZigBee (IEEE 802.15.4)
Max. Working Distance: within 80m from the SONOFF ZBBridge or intermediate router.
Item Size: 4.2*4.2*1.1cm / 1.65*1.65*0.43in
Item Weight: 27g / 0.95oz
Package Size: 4.8*4.5*2cm / 1.88*1.77*0.78in
Package Weight: 32g / 1.12oz

Packing List:
1 * Wireless Switch
1 * User Manual(Multilanguage)
1 * Double-faced Adhesive Tape
1 * Button Cell(CR2450)