I'm selling this because I only used the watch and left this unused. SUUNTO DUAL COMFORT BELT This is the Suunto Dual Comfort Belt. It is a new, unused item. It can be paired with Suunto heart rate monitors or compatible equipment at sports clubs. Compatible with Suunto Ambit, Ambit2, Ambit2 S, Ambit2 R, M1, M2, M4, M5, Quest, t3, t4, t6 heart rate monitors. This belt is not compatible with Ambit3 watches. Please refrain from purchasing if you are concerned about minor details due to storage. The battery is included, but I'm not sure if it works. Thank you for looking.