The Booster is the most powerful basic trainer. It can generate high resistance at low speeds, making it for power-based workouts. The resistance is controlled manually; the resistance control has ten positions. The closed resistance unit reduces noise.A powerful magnetic brake enables you to have intense interval sessions & power-based workouts. Trainers with a magnet brake do not require power. The Booster features two rows of magnets; other basic trainers feature one row of magnets & a disc. The magnetic field increases or decreases by changing the position of the magnets, which is done manually with a lever to set the resistance. Realistic pedal stroke & a 1.65kg flywheel ensure the best ride feel. You can train with the Tacx Training app, Tacx Cycling app, Zwift or Trainer road based on virtual power using the Tacx speed & cadence sensor! This transmits your speed & cadence wirelessly via ANT+ or Bluetooth to your tablet or smartphone. FEATURES Type of trainer: A basic trainer with magnetic brake Magnets: 2x 8 Permanent ferrite magnets Transmission: Roller, 30 mm Electrical requirements: No mains voltage required Power indicator: None Connection indicator (ANT/BT): None Firmware upgradable: No Suitable bikes: Race, Tri & MTB, if necessary with axle skewer Suitable axles: Width of rear fork: Race 130 mm, MTB 13.5cm. Adapters for other widths available Supplied with: Front-wheel support, Quick release for road bikes & mountain bikes (5mm)