The Edelrid Ohm Assisted braking resistor is built to increase rope friction when there is a large weight difference between belayer and lead climber. In the event of a fall, the OHM increases the amount of rope friction so that a lighter belayer can hold a heavier lead climber without difficulty.

Edelrid Ohm Assisted Braking Device Features: 

• Belayer requires significantly less hand braking force to arrest a fall
• Lowering a heavier climber is much easier to control
• OHM is attached at the first bolt in the safety chain
• Should a lead climber fall at the first bolt, the OHM significantly reduces the risk of a possible ground fall
• Rope handling when belaying a lead climber not affected (no additional friction when paying out rope)
• Recommended weight difference (lead climber > belayer): 10 - 40 kg
• Minimum weight belayer: 40 kg
• For single ropes from 8.9 - 11 mm

Specs: 

• Weight (g): 360
• Load Capacity (kN): 20
• Good for sport climbing, top rope and indoor climbing