Invisible Mini Stereo Wireless V4.0 Bluetooth Headphones Universal In-Ear Music Earphone Headset for iPhone 6/6S Plus Samsung S6

Bluetooth Profiles : Handsfree
Transmission Power : Class 2
Frequency range: 2.4GHz-2.4835GHz
Bluetooth Version: V4.0
Operating Range: 10m
Battery: 50mah
Standby Time: 120hour 
Talk Time: 4hour
Charge Time: 2hour