Stereo Bluetooth Headphone Music Headset Support SD Card with mic for mobile xiaomi iPhone sumsamg tablet 1. Bluetooth + MP3 function support stereo music playing, phone calling... 2. Support all audio devices that have Bluetooth capability, such as, cell phone, tablet PC, laptop, computer, etc. 3. 3.5mm audio jack provides a simple wired connection of a variety of devices without Bluetooth. 4. Allow you to answer or reject phone calls anytime and anywhere. 5. Charged via USB, rechargeable battery, convenient and practical. 6. Playing time up to 8~9 hours, and continue talk time up to 8 hours, standby time up to 250 hours. 7. Good quality, foldable design, and adjustable length hinges, very comfortable to wear and easy to carry. 8. Best choice for listening to music, watching a movie, chatting online, etc. 9. with SD card insert, without any Bluetooth device, you can still enjoy music any time anywhere. 10. Cool shinning outlook adds the fashionable feel.   Version: V4.0 Frequency: 2.40GHz-2.48GHz Power: ≤Â? dBm, class 2 Effective range: 10M Sensitivity: -84dBm / 0.1% BER Frequency response: 20 Hz - 20 KHz S/N rate: 70 dB Distortion: 0.10% Speaker size: 40mm  support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5 Voltage: 3.7VDC (built-in 400MAH rechargeable battery) talking time: 8~9 hour standby time: 250hour charge time: 2-2.5 hour current: 40 mA operate temperature: -4 ~ +131°F(-20 ~ +55°C)