fitbit google fitbit air - screenless activity tracker with fitness, heart rate, and sleep tracking - personalized ai-powered coaching - up to 7 days’ battery life - works with ios and android - obsidian fitbit air obsidian one size tracker (130-210 mm) is up for auction in Electronics. The current bid is $1.00, 99% below the $99.99 MSRP, in New/Like New condition. Bid on this item at our Georgetown - Triport Road location before the auction closes.