Silence is golden. Experience the convenience, power and portability of a nearly silent trainer with the STAC Zero Halcyon Smart Trainer. Halcyon is the smartest STAC trainer to date featuring innovative controlled resistance functionality via ANT+ FE-C and Bluetooth Smart (FTMS). Connect with popular training software like Zwift, TrainerRoad and Sufferfest plus compatible devices like Garmin smartwatches. Halcyon combines sturdy steel construction with a rechargeable lithium-ion battery to deliver a durable, fully portable trainer. Hit the road anytime, anyplace and pedal on.