Wireless Bluetooth Music headset Bluetooth solution: Sinoblue Battery: 400mA Horn: 40 centimetres Functions: Add, subtract, Pause/play, MIC Time standby: 48/h Usage time: 24/h Frequency response range: 20-20000Hz Plug diameter: 3.5mm Sensitivity: 115dab/mW How to wear: Bluetooth headset, TF card is supported (TF card is not included, you need to buy extra) What"'"s included: Charging cable + host (including battery) + instruction manual Features: 1. Bluetooth + MP3 function, support stereo music playback, phone calls. 2. Support all audio devices, Bluetooth functions, such as, mobile phones, tablets, laptops, computers, etc. The 3.3.5mm audio jack provides a simple wired connection without the need for various devices Bluetooth. 4. Allow you to accept or reject incoming calls anytime and anywhere. 5. USB charging, rechargeable battery, convenient and practical. 6. Good quality, foldable design, adjustable hinge length, comfortable to wear, easy to carry. 7. The best choice for listening to music, watching movies and chatting online. 8. With SD/TF card inserted, you can still enjoy music anytime and anywhere without any Bluetooth device. 9. Give your children beautiful Christmas gifts, birthday gifts, new year gifts. Best choice for listening music,watching movie, chatting online etc. Three usage modes are supported 1.CF/SD memory card mode, plug in the card can directly listen to music 2. Mobile phone Bluetooth mode, connect mobile phone Bluetooth can directly listen to music 3. Plug in mode, you can directly listen to music by inserting an adaptive 3.5mm audio cable Features: Using flexible sponge air cushion, skin-friendly and breathable Foldable retractable head beam, suitable for different head girth, adults and children can wear Add buttons on the side, quickly control the music, one hand operation is more convenient