Freewave kits are available in a number of varieties. Standard 1, Standard 2 and GSM. The two standard kits are similar, apart from Kit 2 offers an additional PIR. None of these kits include an external sounder as standard, the order code for the kit plus an external sounder can be found by clicking the kit you are interested in - on the product description page you will see the relevant code.

The GSM kit comes with GSM communicator to open up the possiblities for home automation and commmunication.