【Delay and scene setting function】 You can set the function of delay on or off (ranging from 5 minutes to 20 hours), or set the scene (you need to learn the scene remote control after completing the setting). 【Group Control】 Set all smart light bulb sockets as a group and turn off with one key. One lamp head can be controlled by multiple mobile phones. Share it with your family and everyone can easily control it. Great for hard-to-reach lights without an ON/OFF switch 【Multiple remote controllers can be added】Up to 4 remote controllers (APP remote controller + RM remote controller) can be added to the switch device, and if more than 4 remote controllers are added, the data of the first remote controller will be automatically covered. 【25 METERS RANGE OF SWITCH PANEL】You can install the wireless switch panel fixed on other floors, powerful 2.4ghz signal covers up to 80FT in open area, you can control garage, porch, stairs and basement lights from your bed or couch, no wiring required, easy to use. Back panel sliding cover design, you can easily change the battery. Need to buy 2 extra AAA batteries. 【Gateway linkage】 It can be used with 2.4g smart gateway to realize remote control and voice control (gateway needs to be purchased separately)