technical specifications
voltage: 21v max
torque: 350 n.m (maximum)
impact rate: 0-3200 ipm (impacts per minute)
working modes:
precision mode: 2400 rpm
turbo mode: 3000 rpm
motor: long-life, low-loss brushless motor
drive size: 1/2" square drive (suitable for most standard impact sockets)
ebay
battery: 21v 4.0ah marathon power lithium-ion battery with a built-in battery indicator