I purchased this stove for a camping trip and when attached to the butane canister (by following the instructions), the switch wouldn't turn down and the flame got very big. As a result, we had to wait for the gas canister to run out of gas, almost causing an explosion. The flame was 1/2 a meter tall and we were very lucky that the forest floor was wet.
I do not reccomend this product as it is defective and put myself, and my fellow campers at risk.