Product Name: Tws Sport Headset Wireless Headphone Bluetooth Earphone with Charging Box Model NO.: ASHVTI9S Distance version: Class A Specifications: HSP Color: Black Characteristics: Power Display Function: Bluetooth, Multimedia Soundtrack: Dual Track Bluetooth Version: 5.0 Usage: Mobile Phone, Call Center, MP3 & MP4, Computer, Game Player Style: In-ear Trademark: OEM Transport Package: Retail Package Origin: China Product Description Specification:1. Driver: 15mm2. Impedance: 32 OHM3. Bluetooth version: Bluetooth v5.0 + EDR4. Bluetooth use band: 2.4GHz5. Power level: CLASS II6. Output power: 30mW7. Bluetooth distance: 10 meters barrier8. Frequency response: 20-20000Hz9. Operating voltage range: 3.0V-4.2V10. Mic sensitivity: -42dB11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol12. Powerful noise de-noising circuit (active noise reduction)13. switch between Chinese and English (boot does not connect Bluetooth state, press the switch 2 times, hear the tone switch successfully)13. Talk time is about 1-2 hours14. music time about 1-2 hours15. Standby time is about 100 hoursPackage Includes:2 x mini Bluetooth Headphones(left and right earphones)1 x Charging box1 x USB Charging Cable1 x User Manual