Used and in good condition. Includes strap sizes small, medium and large. Color is summer grey (appears to be a cream/off white in real life). Works with the aura app, free in the App Store It measures body compositions to help you meet your fitness goals. Allows you to take real time measurements on the go. Compatible with all Apple Watch models series 3 and later. Fits sizes 38/40/41mm. Uses a coin cell battery (cr1632) included, but uninstalled for shipping.