i.Tech BlueBAND Foldable Bluetooth Stereo Headphones (Sport Red) Bluetooth Specification: Version 2.0 + EDR Class 2 Operating Temperature: -10 to 65o C / 14 to 149o F Talk Time / Standby Time: Up to 8.0 Hrs / Up to 200 Hrs Dimensions: 3.55" (L) x 3.15" (W) x 4.65" (T) Weight: 2.96 ounces / 72.6 grams