Slate Wood Series Pen Battery. Combines real blackwood (which means every piece is unique) and slate anodized aluminum for a visually stunning appearance.The new release features a wider transition module to accommodate wider/larger units. Features a protected, pod drop-in designFits most 510 thread pods (included pod is non-functional and for merchandising purposes only)Powered by a high-quality 300mAh lithium-ion rechargeable battery core3-LEDs indicate battery life and power settingsFour (4) power/voltage settings (2.4V, 2.8V, 3.2V, 3.6V)USB magnetic charging port + cableCompatible with Base Charger and Rover CasesDimensions: 4.3"L x 0.5"DWeight: 29gSix (6) month limited warranty