AS plastic case, silicone lid, Aluminum; Wireless earbuds in clear case featuring convenient carabiner attachment; Power/Technology: Rechargeable Lithium Polymer battery: 37V/55 mAh; Sensitivity: 110 dB; Frequency Response: 20Hz-20000Hz; Wireless V42; Wireless Profile: HSP/HFP/ADP/AVRCP; Transmission Range: 10m (30 ft); Approx playback time: 25 hours for music, 15 hours talk time; Features built-in microphone for answering calls; Must be charged prior to first use Charge time varies by device; Earbuds feature Silicone cover for comfort during use; Includes USB charging cable and instructions; This item cannot ship internationally except to Canada via ground; This item can only ship to Alaska, Hawaii, Puerto Rico and any other small US island territory via Air; Product Size: 2 w x 2.75 h x 1.125 d