1.have different kinds of specification 2.N o loadspeed: 0-550r/min 3.Switch: Forward/Reverse 4.charge time: 3-5hours Voltage: 7.2-18VNo loadspeed: 0-550r/minSwitch: Forward/Reversecharge time: 3-5hoursTorque Grade: 16+1gift box size: 45*23*49.5cm  10PCS/cntBMC box(single battery ): 74*29.5*30.5cm  8PCS/cntBMC box(two battery ): 59*32*31cm  5PCS/cnt