Product specifications:1. Drive: 40mm2. Impedance: 32 OHM3. Bluetooth version: Bluetooth v5.04. Bluetooth use frequency band: 2.4GHz5. Power level: CLASS II6. Bluetooth distance: 10 meters without barriers7. Frequency response: 20-20000Hz8. With A2DP/AVRCP high-quality stereo audio transmission and remote control protocol9. Charging time is about 2 hours10. The talk time is about 10-12 hours11. Music time is about 10-12 hours12. Standby time is about 120 hours13. Battery capacity 250MAH14. Charging power supply: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger)15. Compatible mobile phones: Compatible with 99% of mobile phones with Bluetooth function on Android, Apple, Microsoft and Symbian systemspackage:Bare metal weight: 215gWeight with packaging: 410gPacking box size: 8.8x17.3x16cmPacking net weight: 18KGPacking gross weight: 19KGPacking size: 55*50*46CMPacking quantity: 45PCS/CTN