Here I recommend one from aHappyDeal Company, a professional company focus on this kind of product.
Brief Introduction of Set of Good Quality 503D Wireless Remote Control Door Bell and Doorbell Button
Main Features:Lines grace, light touch button, various kinks of colors for your choice, can bring you a sence of vision enjoy from lines and colors
- Simple, vivid and on-wire installation design avoid troubles and save money when installtion and don't effect decorate environment
- Remote control range from up 100m in open air
- Built-in anti-interference design, avoid the interference between users
- Build in double speakers, make sound clear, especially suitable for homes, offices, factories, hotel, etc
Specification: General: Power supply: 2 AA batteries for doorbell (not included), 1 23A battery for doorbell button: Dimension and Weight: Product weight : 25 g (transmitter), 60 g (receiver): Package weight : 0.140 kg: Product size (L x W x H) : 7.3 x 4.1 x 1.8 cm (transmitter), 9.6 x 6.2 x 3.1 cm (receiver): Package size (L x W x H) : 19.5 x 14.7 x 3.3 cm: Package contents: Package contents: 1 x Remote Control Wireless Door Bell, 1 x Doorbell Button, 1 x 23A Battery:
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