Calvas GSM Relay SMS Call Remote Controller GSM Gate Opener Wwitch For Control Home Appliance Water Pump Motor Rolling Door On Off New

The GSM signal in the water pump is too weak.
The GSM signal nearby the roller shutter door is too bad.
What should  I do?
Please don't worry.
The black gsm antenna with 2m cable can be extened to be some place with stronger gsm signal.
Main Features:
1. With password protection
2. Can set 5 groups of control master numbers
3. SMS control(ON command, Off Command, T Command)
   1)ON Command: turn the relay state to ON
   SMS Text: SN+Password+ON
   2)Off Command (Turn the relay state to off
   SMS Text: SN+Password+OFF
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 mean changing the relay state successfully.
   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
GSM  remote controller, GSM relay, gsm switch, gsm gate opener
    Except for the common function above mentioned, the gsm controller relay has special features as follows.
                                                         Additional Commands
To Command: Inching the relay state
SMS Text: SN + 4 digits of password(0000) +T + inching time (0 to 9)
0    means 0.5 second, 1-9 means 1 to 9seconds
For example: a. Send SMS:  SN0000T0
on-----off 0.5 seconds-----on.  
off-----on 0.5 seconds------off
If the original STATE LED on, it will b