This the Owlet Smart Sock Plus includes the Smart Sock 3 standard, traditional items and also Smart Sock 3 Expansion pack. The extension pack is still factory sealed. Includes: base station (Gen 3), sensor (Gen 3), 4 fabric socks (2 left and 2 right), usb cable, and smart sock 3 extension pack (sealed), Does not include the USB charging block. Fabric socks look in great condition. For testing purposes, I powered on the sock, connected the base station to my wifi, and connected through the Owlet app. The smart sock extension pack includes sock sizes for children 30 - 55 lbs.