Our custom ?Monogram Pen? is a 380mAh battery and comes equipped with a preheating setting to prevent oil from clogging, so you receive an unobstructed, satisfying inhale. PRODUCT DETAILS: Re-Useable. (Can also hold your joints) Crush proof case with vanity mirror Stealthy breathing LED indicator Quality circuit board with multiple protection Inhale activated Battery capacity: 380 mAh Micro-USB Rechargeable