i.Tech i.VoicePRO 901 Bluetooth Headset - Wine Bluetooth Specification: Version 2.1 + EDR Class 2 Operating Temperature: -10 to 65o C / 14 to 149o F Talk Time / Standby Time: Up to 4.5 Hrs / Up to 100 Hrs Dimensions: 2.48" (L) x 0.65" (W) x 0.39" (T) Weight: 0.42 ounces / 12 grams