Two Detachable USB Powered Handwarmers / Three Adjustable Heat Temperatures Size 5.5x5.5inches/Cord length 57inches Two Adjustable Wrist Straps One Size Fits Most Hands-Best for women and children Good for Indoor/Outdoor Use * Laptop and Desktop USB port use only, other kind of USB port will not supply enough power to heat up(ex. Keyboard USB port)