Obecome Heavy Duty Professional Electric Staple Gun Tacker Brad Nail Gun Voltage is only suitable for 110v Suggest to fires up 30 times per minute. Suitable length for nails is less than 15mm, and to buy the nails according to the thickness of plank the nails should not more than 15mm. Only suitable for carpentry's concluding work , and repairing the home furniture or DIY furniture. Only for the general board, ordinary wood, not suitable for the kind of very hard boards.