The Geekvape Aegis Boost 40W Mod Pod System, with the portable design and lightweight only 120g, with food-grade silicone rubber for sealing and waterproofing, corrosion-resistant zinc alloy body frame, and tear-resistant leather sleeve, with the IP67 rated waterproof, dustproof and shockproof features, no worry about accidental dropping or rains, best for outdoor usage. the Aegis Roost with the newest AS chipset has the highly reliable variable voltage and resistant adjustment, the instantly firing speed low to 0.08S, maximum performance on every puff, and advance surge and overheat protection TC system to assure consistent user experience and satisfying outdoor performance. the Geekvape Pod Mod Kit integrates the internal 1500mAh battery and max output 40W, featuring a 3.7ml refillable Pod, with the easy access top refill design, manually adjustable leakproof airflow valve and quick lock and release for switching pod systems features, you can inject your favorite e-juice easily and adjust the intake air freely. the one mod two system device that supports the usage of both Pod and RDTA, provide in the packaging are two separate coils and tips specially designed for MTL & DL vaping experience. if you prefer to build the Coils by yourself, the Aegis Boost also compatible with the RDTAs( Rebuildable Dripping Tank Atomizers ), bring you more DIY fun and meet the different vaping demands. the RDTA part sold separately.