Features:

Bluetooth 4.1 increases Battery Life dramatically while letting you travel further than ever before.
The Highest Audio Quality
The D9 uses the highest quality transducers and hardware, as well as Bluetooth 4.1, and stereo transfer protocols. That means bigger bass, lighter-than-air treble, and perfect phone call clarity EVERY time.
The Most Revolutionary Toughness
We designed the D9 so that it can withstand even the toughest environments. The earbuds are made from Aviation Grade Aluminum-Magnesium-Alloy which doesn't add weight. (not for swimming)

Specification:

Bluetooth Version: V4.1
Sound Mode: Stereo
Charging time: 1~2 Hours
Standby time: 180 Hours
Talk/Playing time: 5~6 hours
Operation distance: 10 Meters
Connect 2 phones: Yes
Power Source: Built in Rechargeable Battery 70 mAh

Applicable to:

For Apple IOS iPhone 7/6/5/4/ iPad Series
For Android Phone , Smartphone
For Most of Devices with Bluetooth ...

Packing List:

1 x D9 Bluetooth Earphone
1 x USB cable
1 x User manul
1 x Retail box