DF-BOX features extended 650mah battery with 3 variable voltate settings. The compact battery compatible with universal 510 thread cartridges. Key Features： Car key style 650mah capacity 3 variable voltages Preheat mode Rubber finish G-BOX Mod: Product Size: 87*41*20mm A packing weight: 110g A unit weight: 85g Colors: Black & Red Thread: 510 Thread Maximum Current: 15A Battery capacity: 650mah（ built-in 13450 battery） Variable voltages:Red/3.2v,Blue/3.7v,red and blue combination/4.2v 5 clicks to ture on/off 3 clicks to adjust the Voltages 2 click to preheating Material: ABS + PC The Box Includes: 1x 650mah Battery 1x Lanyard 1x Micro USB Cable 1x G10 1.0ml Cartridges by your choose(Colors are sent randomly, if you have special requirements, please leave a message） 1x User Manual To find more hight quality pens ? USD 15.17/pieceUSD 13.84/pieceUSD 23.92/pieceUSD 15.83/pieceUSD 17.39/pieceUSD 10.43-22.61/pieceUSD 19.83-22.52/pieceUSD 21.43-23.21/piece Customer Service We offer 7/24 full time service,Please feel free to contact me if you have any problem about the product or shipping. Your inquiry will be replied within 8 hours. Shipping Item will be shipped within 2 working days after receiving a verifying payment. Please contact us within 30 days from dispatched if you don’t receive our item. Normally,It will takes 15-40 working days to your country by Registered Air Mail. But the shipping time to South Africa,Brazil,Mexico ,Peru and Argentina always takes about 2-3 months. 7-20 working days by epacket. 3-7 working days by DHL. Feedback After you receive the item, please check it. We appreciate your positive feedback if you are satisfied with the item. Gift or discount will be given to you in your next order. If there is any problem with the item,do not hesitate to contact me. We will reply to you in 24 hours. A proper solution will be given ASAP. Please do not open disputes, or leave a neutral or negative feedback, about us without any communication.