Description: 1.Bluetooth connection: Wireless connection, frees you from twisted or kinked cable. Up to 10 meters operation range, no need to worry about the disconnection while you are on a move. 2.Music card support: This headset is like an MP3 player. You can insert the music card in the headset and listen to all the music you want. 3.Audio cable applicable: If the headset runs out of power or you have to connect it to a device with no Bluetooth connection, you can connect them with a 3.5 mm audio cable. This is a very convenient and thoughtful design. 4. High quality: Built-in high-quality audio coded, giving you excellent voice experience, Ergonomic design make this headset comfortable for long time wearing. The foldable design makes it easy to carry with. 5. Multi-functional: This headphone has more functions than you can imagine, like Radio Function, with a built-in radio antenna and a radio set, this headset is like a radio.Specifications: Bluetooth version: ISSC4.1 + EDR.Support Profiles: HSP, HFP, A2DP, AVRCP. Profile and Advanced Audio Distribution Profile(A2DP). Operation distance: 10m. Transmitting Power: Class 2. Frequency Range: 2.4026 GHz-2.480 GHz.Resistance: 32ohm. Sensitivity: 105dB+ / - 3dB. Rechargeable lithium battery: 300mAh. Talking Time: 8 hours. Music Playing Time: 4 hours. Standby Time: 120 hours. Charge Time: 2-3 hours. Plug Type: 3.5mm.