This is a control program for the GSM A22 Heat-Link device. You can power on/off the different channels by choosing different commands.Features:* Control all four groups.* Power on or off more than one group with the same message.* Control the alarm.* Send status requests.* Enter the phone number once and the app remembers the number.Additional features for pro version:* Receive answers from the device in the app.* More features will be added for paying users in the future.for pro features buy the GSM Control pro unlock app in the Android Market.