Two-way Control: The SONOFF smart switch supports 2-way control. You just need to install one ZBMINIL2 to connect 2 core wires between the 2 switches, which will achieve dual switches controlling one light. Support External Switch: Our smart light switch can work with various external switches to control your devices, such as rocker switches, wall switches, etc. No neutral wire is required for easy installation and use. Multi-functional: ZBMINI Extreme can set countdown/ scheduled/ loop timers to design your situational life. This smart switch also works well with Amazon Alexa and Google Home to turn your light on/off by voice command, which makes your life easier. Zigbee 3.0 Standard Compatibility: This smart switch can combine with Zigbee hubs to a home LAN, no longer worry about the internet. You can control the appliances normally even if the light is as low as 3W, and no anti-flicker module is required. Super Tiny Size: The SONOFF Zigbee smart switch can easily fit in the smallest EU type/86 type/120 type mounting box. The product size is 39.5 * 32 * 18.4mm.