Guudgo GD-MD01 Wireless Doorbell from Banggood 

Guudgo GD-MD01 Wireless Touch Screen Music Doorbell (Portable Waterproof)
Buy it from Banggood.com: www.banggood.c...
A doorbell may seem like a simple device, but a functioning system is important for any home.
Not only does it notify you when guests have arrived, but it can also help keep you and your family safe.
Modern design meets technological innovation in the Wireless Doorbell from Guudgo!
This system includes one push button (transmitter, 1.61” x 3.11”) and one door chime (receiver, 2.53” x 4.08”) for a complete, all-in-one kit.
It provides an incredible support range of up to 150M, ensuring you’ll hear it in every room of the house. It also features 52 melodies and 5 volume levels for a customizable experience. With a state-of-the-art touch sensor and automatic coding capabilities, our doorbell is just as sleek and modern as it looks!
For your convenience, we provide the hardware needed for a quick installation. Use the double-sided sticker for temporary hanging, or use the anchors and screws for a long lasting hold. As an industry leader, Guudgo is committed to providing practical, premium products!
Our wireless doorbells are expertly crafted and boast an IP44 weatherproof rating.
From heat and rain to snow and freezing temperatures, this unit can withstand it all.
Specification :
Product number:GD-MD01
Color: Black
Dimension: 5 x 5 x 5 cm ; 100 g
Weight: 259g
Power supply:
Receiver - 3pcs AA 1.5V battery(Not Included)
Transmitter - 1pc 23A 12V Battery(Included)
Package Includes :
1 x Door chime (Receiver)
1 x Push button (Transmitter)
1 x User manual
1 x Color Retail Box