Sharper Image Traxx Activity Tracker Black Easy to use, Unisex design, available in black, Adjustable wristband fits most men and women Includes free app for iPhone/iPad/iPod touch or Galaxy/Android, Pairs easily with your device, using Bluetooth 4.0 technology Compatible with Apple devices running iOS 6.0 and later, including iPhone (4S or newer), iPad (3,4, mini, air or newer) and iPod touch (5th gen or newer), Compatible with Samsung Galaxies and other Android devices running OS 4.3 or later, Data syncs automatically with app Sweat-proof rubberized bracelet provides 24/7 comfort, Tracks sleep length and quality, Built-in pedometer function tracks steps taken, speed and distance traveled, Tracks calories burned, Activity statistics are mapped out by day, week and month, Optional silent vibration alerts for incoming calls, texts and alarms Proximity alarm: vibrates or beeps when your device and phone are too far apart Runs approximately 5 days on a full charge, Charges via USB with included cable