actualy the device costs about $1200 each but on this particular fire there were 2 cars in the yard and a purse still on the front seat of one of the cars so the thought was that there is still people inside so the desision was made by a firefighter jeff galm to throw the device to try and slow the spread of the fire to give us time to do our search. it made a great difference it held the fire to that room for several more minutes until we could establish an aggresive interior attack it made a difference for that house standing and that house being burned down to the ground in my mind and looking at the way the fire was held that if we did not deploy the device we would have lost the whole house