Daddario GH Humidifying System

Gets dry after 3 days. The sponge is nothing but a cheap bathroom sponge, the quality is terrible. The rest is an plastic cup with an unreliable locking system... I have the D'Addario GHP. It is a bit more expensive but it holds humidity for 6-7 days and has much better build quality. I don't recommend the GH. Too pricey. Cut piece of sponge yourself, drill 3 holes in a Tic Tac box and you have a match for the DAddario HP.