|  Koss BT539i£79.92 |  | |
| Wireless | Wireless | |
|---|---|---|
| Bluetooth | Yes |  | 
| Bluetooth Version | 4.0 |  | 
| Audio Features | Audio Features | |
| Impedance | 38.0 ohm |  | 
| Speaker Configuration | 2.0 (stereo) |  | 
| Frequency Response (min) | 10.0 Hz |  | 
| Sensitivity | 97.0 dB/mW |  | 
| Frequency Response (max) | 20000.0 Hz |  | 
| Product Properties | Product Properties | |
| Colour | White, Grey |  | 
| Power Supply | Power Supply | |
| Battery Time (standby) | 40.0 h |  | 
| Battery Time (in use) | 12.0 h |  | 
| Features | Features | |
| Foldable | Yes |  | 
| Suitable for Training | No |  | 
| Noise Cancelling | Active Noise Cancelling |  | 
| Microphone | Yes |  | 
| Background Noise Activation | No |  | 
| Buttons & Controls | Skip Song, Play/Pause, Volume, Answer/Hang Up |  | 
| Wireless | Yes |  | 
| Detachable Cable | Yes |  | 
| Design | Design | |
| Acoustic Seal | Closed |  | 
| Construction & Elements | Dynamic |  | 
| Type | Type | |
| Type of Headphone | Over-Ear |  | 
| Gaming Headset | No |  | 
| Additional Info | Additional Info | |
| Brand |  | |
| Created at PriceRunner | 17 January 2019 |  |