The G2 WiFi Gateway Hub Bridge by SMONET is a black, modern-looking device designed for keyless entry systems, specifically compatible with TTLock APP for smart door locks and deadbolts. This WiFi gateway has a small diameter of 3.5 inches and a sleek brushed finish, making it suitable for front entrance and security doors. It does not require batteries and is manufactured with Acrylonitrile Butadiene Styrene material. This hub bridge also offers smart home compatibility with Google Assistant and Amazon Alexa, providing added convenience and security for your home. With a manufacturer warranty of 1 year, the G2 WiFi Gateway is a reliable and efficient addition to your door hardware system. Perfect condition cleaner ready to go and installed and never use. Seller has perfect ratings and ships fast and secure. I’ve been on eBay for 28 years. Have fun!