Sonoff 4CH Pro a 4 gang WiFi switch. Users can remotely on/off the adjunctive lights/appliances by iOS/Android App eWeLink or 433 MHz RF distant. They can 8 enabled single/repeat/countdown timers to automatically turn on/off at the nominative time.The timers can run themselves even network is inaccessible. To let the devices be obsessed by their family, they can simply the devices to them and give nominative timers permissions. They can even some scenes or bright scenes to trigger ON/OFF the switch .3 temporary modes : In automatic mode, users can turn on/off the 4 adjunctive devices instantly and separately. In interlock mode, users can on 1 device every time, and turn off opposite devices at the corresponding time. In inching mode, users can on adjunctive devices for 0.25-4s -LRB- the time is adaptable -RRB-. Users can some devices in inching mode, while the others in interlock mode.Now the Sonoff 4CH Pro can perfectly works with Amazon Alexa. Just Alexa to turn on/off Sonoff 4CH Pro. Please that exclusive US/UK English people and Teutonic voice commands are supported now. The default names for the 4 gangs are : 1, outlet 2, outlet 3, outlet 4. You can the name if you like.Standard voice spirit commands phrases for Sonoff 4CH and Sonoff 4CH Pro : Alexa, turn on -LCB- deviceName -RCB- -LCB- gangName -RCB- Alexa, turn off -LCB- deviceName -RCB- -LCB- gangName -RCB- Explanation : if the device name of your Sonoff 4CH is `` My Switch '', the gang name is `` Outlet 1 '', then you can spirit with `` Alexa, turn on My Switch Outlet 1 ''. Specification • Voltage : 90-250v AC -LRB- 50/60Hz -RRB- / 5-24v DC • Max on-line : 10A/gang • Max Power : 2200W/gang • Wireless Frequency : WiFi 2.4 Ghz • Operating Temperature -LRB- recommended -RRB- : 0ºC-40ºC -LRB- 32 °F -104 °F -RRB- • Operating Humidity : 5 % -90 % RH, Non-condensing Package Sonoff 4CH Pro * 1 Note : the RF distant is not included, please order separatelyManual : http://ewelink.coolkit.cc/?p=458 .