Model DF001D is a cost-effective and lightweight in-line cordless screwdriver powered by 3.6V/1.5Ah built-in Li-ion battery. Voltage: 3.6 v Battery Type: In-built Li-ion Charge Time: 3-5 hrs No Load Speed: 220 rpm Driving Shank: 1/4" Hex Max Fastening Torque: 4 Nm Capacity: Wood Screw 3.8mm x 32mm mm Overall Length: 287 mm Net weight: 0.36 kg Vibration no load: 2.5 m/sec Vibration K factor: 1.5 m/sec Noise sound pressure: 70 dB(A) Noise K factor: 3 dB(A)