Description:
The Bluetooth headset enables you to enjoy great sounds on-the-go. Comfortable and snug fit make sure the headset stays put when you are out running, jogging or exercising. When you are done with your music, simply hang it on your neck and wear like a necklace. 

Features:
Get Your Best Fit: This Sports Bluetooth Headphones comes with 3 different sizes of ear buds so that you can find the best fit for your ears. Besides, you can wear the earphone like a necklace when you not using it and do not worry about it lost.
Advanced Technology: The wireless running earphones feature Bluetooth V4.0 and CSR8645 advanced chip which provides faster connection to your smart phones, tablets, and other Bluetooth-enabled devices and broad high resolution sound with powerful deep bass within 33ft range. 
Take Calls Hands-Free with Built-in Mic: Hands free phone conversations are loud and clear with these on-ear headphones - even if you're walking along a noisy or windy street. The built-in microphone features noise reduction and echo cancelling technology and A2DP technology to reduce unwanted background noise and provide lossless crystal clear audio quality when listening to your favorite songs, videos, podcast and much more. 
Multi-function: In-built microphone and 4 buttons remote enable you to manage more conveniently - from skipping a song, to answering a call without touching your phone. It can connect two mobile phones at the same time.
Ultra-Long Working Time: With 300mAh high capacity rechargeable build-in lithium battery, the wireless headset last up to 10 hours music time, 8 hours talk time and 500 hours standby time for a 2 ~3 hours charging time. 

Specifications:
Color: Blue and Black
Bluetooth version: CSR8645 V4.0
Transmission distance: 10 meters (Open space)
Battery capacity: 300mA
Talk time: 8 hours
Music time: more than 10 hours
Standby time: 500 hours
Charging time: 2-3 hours
Speaker: 16Ω 20mWx 2
Speaker size: 30mm
Speaker Impedance: 32o ± 15%
Speaker frequency range: 20 ~ 20KHz
Speaker output S.P.L: 93 ± 3db * 20mw / 30mm
Sensitivity: DBM -80
Signal to noise ratio: 95dB
Orientation: All directions
Frequency range: 2.402GHz-2.480GHz
Transmit power: 0dBm. Sec (up to 4dBm)
Working voltage: 3.7V
Working current: 20mAh
Package weight: 87g

Package List:
1 x Bluetooth Headphone
1 x USB Charging Cable
2 x Pairs of Earbuds
1 x User Manual