Bluetooth earbuds
1：Bluetooth Version： BluetoothV 2.1
2：Support profiles：Headset, Handsfree, A2DP, AVRCP
3：Operation range：10M
4：Battery ：3.7V80MAH
Want more concentrate and enjoy your exercise? Let's get ready for workouts with Bluedio S2 Sports Bluetooth Headset! S2 is crafted from its streamlined appearance, superb bass resonance with 3rd generation in-ear earphone, wind noise reduction, sweat-proof, Bluetooth V2.1 , to give you superior enjoy on workouts!
Specification: 
Bluetooth version: ： BluetoothV 2.1
Frequency range: 2.4GHz-2.48GHz
Operating distance: up to 10m (free space) 
Bluetooth profiles: A2DP、AVRCP、HSP、HFP