Quantity   Component name
1 × A6 GSM/GPRS development board dx.com/p/433790
1 × Arduino Nano Any Arduino with at least a 328P processor could be used. You also need a PC with the Arduino Integrated Development Environment.
2 × NPN transistor Any NPN transistor is acceptable
3 × 1K resistor Anything in range 200 to 1K is acceptable
2 × 4K7 resistor Optional, used to pull down the transistor base if the gate module is sensitive to spikes during power-on
2 × 1 uF capacitor Optional, used to eliminate spikes on the transistor base if the gate module is sensitive to spikes
1 × 5 volt power supply At least 1 amp, GSM module may fail to connect to a network if there is not enough current
1 × 470 uF capacitor Optional, used to smooth out the 5volt power supply, use a smaller capacitor with a good quality power supply