ONIKUMA B2 Headset Headworn Wireless Bluetooth 2.4 GHz Three-Mode Wired Headset E-sports gamers' lightweight headphones Extended Sturdiness： Fully charged, the battery lasts for about 25 hours. Adaptable Application: Playback from wired, wireless, and 2.4G connections is supported. It is versatile and easy to use. Key Control is extremely practical: To master various adjustments, press the physical button located on the left earmuff at your discretion.