Monster Open Free AC100 Open Ear Headphones, Bluetooth 5.3 Wireless Headphones, Immersive Stereo Sound by Dual Large Driver, Clear Talk, 30H Playtime, Waterproof Earbuds for Running, Black is up for auction in Electronics. The current bid is $37.00, 62% below the $97.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.