Features: 1. Comfortable To Wear, Clear Calls, , Easy To Carry 2. Using The 5.1 High Version Bluetooth Chip, The Call Effect, Compatibility And Functionality Have Been Significantly Improved, Tending To Zero Lagging And Delay. 3. Widely Compatible With And Android Systems, It Can Be Used On Mobile Phones, Tablets And Computers With Bluetooth 4. How To Pair: Take The Earphones From The Charging Box. After 3 Seconds, The Earphone Display Light Goes Out. 5. Wireless Car Call Noise Reduction Lavalier Style Single-Sided Headset 1. Chip Model: Ac6983d 2. Bluetooth Protocol: A2dp 1.3 Avctp 1.4 Avdtp 1.3 Avrcp 1.5 Hfp 1.5 Spp 1.0 Rfcomm 1.2/Pnp 1.3 Hid 1.0 Core4.2/12cap Core 4.2 3. Bluetooth Version: Bluetooth V5.1 4. Bluetooth Chip : Qfn20-3*3(Mm) 5. Working Distance: 10 Meters (No Barriers) 6. Frequency: 2402~2480mhz 7. Call Duration: About 20 Hours 8. Music Listening Time: About 20 Hours 9. Standby Time: About 6 Months 10. Charging Time: About 1.5 Hours 11. Call Mode: One-Ear Call 12. Headphone Battery Type: Polymer 13. Headphone Battery Capacity: 3.7v-4.2v (30mah) 14. Headphone Charging : Contact Material: plastic colour: black Package Contents: 1 x Lavalier Style Single-Sided Earphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.