?babytone Babytone Baby Sleep Sock Monitor, Tracking Heart Rate and Movement for Infant, Wearable Foot Monitor Smart Sock with Bluetooth and APP, for 0-36 Months Newborn is up for auction in Baby Products. The current bid is $5.50, 96% below the $130.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.