Specifications: Bluetooth version: V5.0+EDR Protocol support: HSP, HFP, A2DP&AVRCP Bluetooth distance: 15M Frequency response: 2.4GHz Left and right channel isolation: 66Db Power supply mode: 5V/1A (the product will automatically turn on after power on, and the blue LED light will flash) Power on: Power on (blue LED flashes, Bluetooth is waiting for connection) Shut down: Long press the multi-function knob button to shut down the 2S product (the blue LED light is off) Bluetooth connection: pair the mobile phone's Bluetooth with the product's Bluetooth (the blue LED light is on, the Bluetooth connection is successful) Knob button: short press to pause/play when playing music (LED is always on) Knob button: Turn left to the previous song (LED is always on, song is switched) Knob button: Rotate to the right for the next song (LED is always on, and the song is switched) Knob button: turn left for a long time without loosing, the volume decreases (the LED is always on, the volume decreases to no sound and mute) Knob button: Rotate to the right for a long time without loosening the volume to increase (the LED is always on, and the maximum syllable has a beep) Package includes: 1*Bluetooth USB 5.0 Receiver 1* Type-c charging cable 1* 3.5 audio cable 1* Lotus line