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https://www.aihomestyle.com/products/1-gang-bluetooth-switch-module/

This 1 gang bluetooth remote switch Module enable you to remote operate your smart home through All-in-one Mobile App with no wifi connection. Support Alexa and Google Home. It can be used in lighting and household appliances, Such as refrigerators, water heaters, TV, air conditioner, electric fan, etc.

Features Of 1 Gang Bluetooth Switch Module
Compatible with most Bluetooth 4.0 mesh gateway.
With BLE Mesh Gateway, the distance between Phone and Device can be more than 10m.
With no BLE mesh gateway, the distance between Phone and Device is 10m.
Easy to install behind the existing switch, keep function of manual switches.
App control is synchronized with the manual switch.
Voice control compatible with Google home and Amazon Alex etc.
Schedule,group, scene, automation functions organizable with other smart home devices,easily achieve home automation.
Accept customer customization for logo, color box. etc.