This is a eco-friendly mechanical timer, made from PC plastic.You must understand how it works. Please read the instructions before use so as to prevent timing errors. For example,to set the timing of 5 minutes. First, see that the initial state scale is 0, then turn it clockwise to 55 minutes and then hen turn it back counter clockwise to 5 minutes. The timer will sound automatically when the 5 minutes has passed. Note: Whenever you want to set the time for 5 or 10 minutes, you must first twist to 55 minutes first, this step activates the spiral spring mechanism. 60 minute timimg maximum. No battery is required.
