Yison Celebrat A18 Bluetooth Headphone comes with Bluetooth Wireless Version: V 5.0. This Headphone featured with Working Frequency: 2402~2480mhz, Transmission Distance: 10m, Optimal Distance: <6m> Drive Unit: 40mm, Impedance: 32Ï‰Â±15% , Sensitivity: 97dbÂ±3db and Frequency Response: 20hz-10khz. Here used Lithium Battery 3.7v/ 300mAh. So that, you can enjoy Playing Time: About 8 Hours (70% Volume), Talk Time: About 6 Hours (90% Volume), Standby Time: About 50 Hours. And also it comes with Micro USB Dc5v 500ma Input Voltage and take About 2.5 Hours of Charging Time. The new Yison Celebrat A18 Bluetooth Headphone has no warranty.