Wireless earbuds in clear AS Plastic case with Silicone lid featuring convenient Aluminum carabiner attachment._x000D_ . Power/Technology: Rechargeable Lithium Polymer battery: 3.7V/55 mAh; Sensitivity: 110 dB; Frequency Response: 20Hz-20000Hz; Wireless V4.2; Wireless Profile: HSP/HFP/ADP/AVRCP; Transmission Range: 10m (30 ft). _x000D_ . Approx. playback time: 2.5 hours for music, 1.5 hours talk time._x000D_ . Features built-in microphone for answering calls._x000D_ . Must be charged prior to first use. Charge time varies by device. _x000D_ . Earbuds feature Silicone cover for comfort during use._x000D_ . Includes USB charging cable and instructions.