The Mechanical Stone Maxi Box with electronic board takes maximum power from the battery with no harm to button. The button is a stainless steel band. Also, the board has special overdischarging and reverse polarity protection. For 20700/21700 battery.
Size: 25x31x85 mm Battery: 20700/21700 Weight: 76 gr Material: stainless steel and natural acrylic stone Color: Blue Sky/Ruby Wine Price: €119