Edun's branded pen battery is designed specifically for Edun's live rosin wide-bodied cartridges. With button-activated draw and optimal battery life, your customers get reliable results and a consistent excellent vaping experience. The stainless steel body with the soft touch leather-like luxurious exterior finish exemplifies quality. LIVE ROSIN VAPING: Our THK pen style battery was constructed exclusively for EDUN with a 2.9v fixed voltage that is designed to give you a live rosin tailored vaping experience. Turn on or off with 5 quick clicks. For Live Rosin always fire at 3v or lower. Please be sure to let your customers using their own batteries to select a voltage setting at or below 3.0v.