Each smart switch has 4 gangs that can be used to control lights and other home appliances at the same time in four areas of your home. Note: 1. The device only works with 2.4GHz WiFi. 2. If the router is working in dual-band (2.4GHz & 5GHz), please upgrade the eWeLink app to V4.0.0 or above. 3. The Pairing will fail if a wrong WiFi password is input. 4. The device shall get close to router for a good transmission signal condition while pairing. 5. RF control is only for 4CH PRO R3. There is a major difference between 4CHR3 and 4CHPROR3, which is 4CHPROR3 is designed with an additional function for RF control. The function is purposely adopted to make you turn on/off the device connected with 4CHPROR3 via the RM433 remote controller. Specifications: Model: 4CH R3 Enclosure Material: PC V0 Color: White Voltage Range: 100-240V AC 50/60Hz Max. Load: 10A/2200W/Gang, 16A/3500W/Total Wireless Frequency: WiFi 2.4GHz Wireless Standard: IEEE802.11 b/g/n, 2.4GHz(2400M-2483.5M) Security Mechanism: WPA/WPA2 Compatibility: Compatible with Android 4.1 or later, iOS 9.0 or later Wiring Way: N and Light Gang: 4 433MHz Remote Control: No Dry Contact: No AC Input: Yes DC Input: No Operating Temperature(recommended): -10C-40C(14F-104F) Operating Humidity: 5%-95%RH, Non-condensing Item Size: 14.5*9*3.4cm / 5.7*3.54*1.33in Item Weight: 188g / 6.63oz Package Weight: 218g / 7.68oz Packing List: 1 * Switch Controller 2 * Hook 1 * Screwdriver 1 * User Manual