For this product, there are two models, one is with 4ch and one model is with 8ch; Pls choice the Best one as your request!!!

Name: 4 Channels of Gsm Relay Switch Call Sms Remote Control Household Electrical Appliances (Light, Curtains, Garage Door etc.), High Power AC Motor,Remote Base Station, PBX Switchboard, Water Pump, Router, Server Etc.

*SMS/Free Call Control 4 Relays On or Off via On/Off Command

*SMS Control Electric Door Gate from on to off (0.5 to 9 seconds), then back to on; or off to on (0.5 to 9 seconds), then back to off ( Available for 4 relays)

*Free Call Control Electric Door Gate from on to off (0.5 to 9 seconds), then back to on; or off to on (0.5 to 9 seconds), then back to off ( Only available for first relay )

*Timed control other electric devices from on to off (001 to 255 minutes), then back to on; or off to on (from 001 to 255 minutes), then back to off via SMS (Available for 4 relays )

Main features:

1. With password protection
2. Can set up 5 groups of control master numbers
3. SMS control(ON /Off/ COM/T/L/XT/ Check command)
4. Free Call to control
User can control the GSM controller by dial the SIM card number of GSM controller. The user may hear” You can’t answer the phone call, beep, beep…….tone etc”, which meanchanging changing the relay state sucessfully.
If the controller connected, it will change to be disconnected state after a call.
If the original state is off, it will change to be connected state after a call.
5. Button Control
The controller state will be changed when you press the SW button at side of controller.
If the controller connected, it will change to be disconnected state.
If the original state is off, it will change to be connected state.
6. User can send sms to check the on/off state
SMS text: SN+Password+CHECK
7. With Power off memory Function

8. sms call remote control household electrical appliances, high power AC motor, Generator, remote base station, PBX switchboard, water pump, router, server etc.

the following is description for cl8-gsm: