Product Parameters: output power: 32 ohms 45mW frequency response: 200Hz-2000Hz sensitivity: 120db 3db signal-to-noise ratio: greater than equal 90DB distortion: 0.5% Bluetooth standard: Bluetooth 4.1 + EDR support protocol: HFP. A2DP.AVRCP supports 3.5 audio input power supply mode: built-in lithium battery 190mAh when charging, it is: 3 hours (please extend the charging time for the first time) Effective distance: 10 m Working hours: more than 10 hours Standby time: 250 hours charging interface: -USB built-in microphone, support digital signal processing Cancellation Technology Style: Headphone Vocalism Principle: Dynamic Control Button: Yes Active Noise-Cancellation: Yes Communication: True Wireless Volume Control: Yes Wireless Type: bluetooth Is wireless: Yes Support APP: No Function 1: For Internet Bar Function 2: Monitor Headphone Function 3: for Video Game Function 4: Common Headphone Function 5: For Mobile Phone Function 6: HiFi Headphone Function 7: Sport Plug Type: Line Type Connectors: 3.5mm Model Number: DW2570 Codecs: AAC Support Memory Card: Yes Waterproof: Yes With Microphone: Yes Line Length: 1.5m Model Number: BQ618 Bluetooth Headpone Driver Diameter: 30mm color:White Material:ABS Package Contents: 1 x Bluetooth Headphone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.