Brand N/A Model HD38 Quantity 1 Color Black Bluetooth Version V2.1 + EDR Ear Coupling Behind the Neck Talk Time 8 Hour Standby Time 200 Hour Operating Range 5~8 meter Compatibility V2.0 / V1.1 / V1.0 Microphone Yes Radio N/A Supports Music Format MP3 / WMA / WAV Power Supply Built-in battery Built-in Battery Capacity 3.7V / 430mAh Compatible With Cellphones w/ bluetooth / MID Other Features Supports TF card up to 16GB; Interfaces: TF slot mini USB / 3.5mm; Bluetooth protocol: HSP / HFP / A2DP / AVRCP; Range: 5~8m; Frequency: 2.4~2.48GHz; Talkign time: 8h; Playing time: 8~9h; Battery: 3.7V / 430mAh; Charging time: 1~2h Packing List 1 x Headphone 1 x USB cable (80cm)