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 a 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 headsets comfortable for long time wearing. Foldable design makes it easy to carry with. 5. Multifunctional: 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.