This smart wifi module with mini design suits for wall switch box,and easily hide it into your hidden wall switch box of your traditional switch without any influences on your original decoration style to make it smart.More importantly,your traditional switch and this smart module can work independently under non-interfering mode. (Note:This module is only suitable for rocker switch,see figure 2 for details.) The mini wifi switch is compatible with AC and DC power sources, working voltage: AC90-250V 50/60Hz, or DC15-250V.Support 1 Way or 2 Way (2 switches control 1 light); simply connect to 1 of the 2 switches and convert the connected device into a smart one (for 2-way circuit) The MINI WiFi Switch is compatible with Amazon Alexa ( Amazon Echo/Echo Dot/Amazon Tap) and Google Home Assistant. It allows you to use your voice to control home devices and enjoy hands-free experience. Take full control of connected appliances with timers, schedules and countdown (1/5/30 mins, 1 hour, etc.) with the app; share control with family and friends for added convenience Control with your smart phone via Smart Life/Tuya app without a separate hub.NOTEThe router must be 2.4GHz (5.0 GHz WiFi is not supported), but there is no limitation for smart phone network (2G/3G/4G/WiFi network is ok). Input voltage: 100-240V 50 / 60Hz or DC15-250V Maximum load current: 16A WiFi standard: 2.4GHz 802.11 B / g / n Application Name: Tuya smart / Smart Life Size: 41 * 41 * 22mm Certified product:CE /UKCA /FCC /ROHS Package Included1*mini smart switch module 1*Manual