The Link2Home Doorbell Chime Kit simply plugs into any USB power supply and connects to your Link2Home doorbell over WiFi through the Link2Home Pro app. This means you do not need to be near your doorbell or smart doorbell device when someone rings the doorbell. Small in size but big on noise, the Link2Home BellChime emits a loud 120dB alert when you have visitors. It features the option to choose from 4 different melodies with crisp, clear sound. The volume can also be adjusted within the app screen for full control and versatility. This doorbell chime for hardwired or battery connections will sync with your device over WiFi with a range of up to 20m. It is simple and easy to set up with two button presses. Reset the chime with one button press and then sync with your doorbell with another button press on your doorbell device. System requirements: WiFi connection, mobile smartphone or tablet with iOS 8 or later, or Android 4.1 or later, free Link2Home Pro app account. Pair with the Link2Home Wired Smart Video Doorbell or the Link2Home Wireless Smart Video Doorbell. Full app integration and voice control through Amazon Alexa-enabled devices or Google Home devices. Features: Integrated Smart Home Product: Connects to your Link2Home doorbell over WiFi through the Link2Home Pro app. It means you do not need to be near your doorbell or smart device when someone rings the doorbell Powerful Sound: A loud 120dB alert with the option to choose from 4 different melodies. The volume can also be adjusted within the app screen Discreet Design: Measures just 60mm wide and 24mm deep. The sleek, innovative BellChime blends seamlessly into your environment. Easy to install and use Preconfigured and Ready to Use: Simple and easy to set up with two button presses. Reset the chime with one button press and then sync with your doorbell with another button press on your doorbell device Specifications: Dimensions: H:2.3 x W:6.6 x D:6.0 cm Colour: Black Guarantee:2 years Material: Abs Plastic Model Number: L2H-BELLCHIME