The multi color LED lights of the Cirrus allows you to detect wind or thermals, even in total darkness. Perfect for detection and tracking purposes, this ultra-responsive wind indicator doubles as a white light flashlight or as a red light for retaining night vision. The cartridges are replaceable and last over 1000 puffs per cartridge. The ultra sensitive bellows design allow easier control of the “cloud-like” reaction. The indicator itself is a USB rechargeable device that doubles as a power bank for charging cell phones and other portable electronic devices. The battery can last over 100 hours on a single charge.