Features: bluetooth version: 5.2 sensing distance: 10-15 meters play time: 3-4 hours intelligent noise reduction: yes standby time: 6 hours earphone charging: 1 hour charging of storage box: 1-2 hours charging compartment capacity: 350mah, headphones 35mah (full amount) product configuration: 1 * a pair of headphones 1 * charging case 1 * usb charging cable function: 1) can support both ios and android devices, as well as any device that has bluetooth connect (laptop etc.) 2) very short latency. Almost no delay for sound transmission from device. 3) quick connect. Pro4 connects in less than 2 seconds upon turning on bluetooth connection. 4) good battery life. Can use up to 4 hours continuously. A full charge for charging case can last for a whole day usage. 5) supports touch and gestures. A) left double tap will trigger siri.