About the Device: Simplicity and satisfaction perfectly shaped to fit in your hand or pocket.The Rock is a refillable open system that works with all types of fluid, for example, Max VG, 80/20, 70/30, and 50/50 fluids. Also it works great with Nic Salts.Features: -1 x rechargeable?áRock device. -8 Hours of heavy vaping per charge -Charges in 45 minutes. -Easy to refill. -Long lasting replaceable vapor modules. -Light good looking and rugged. -Incredibly user friendly.