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![Neoteck Portable 3.5mm Headphone Amplifier with Bluetooth 5.0 Receiver, Two-Stage Gain Switch, HiFi Headset Amplifier, Aluminum Matte Surface [Newest]: Amazon.co.uk: Electronics & Photo](https://m.media-amazon.com/images/I/61LeiO-1aUL._AC_UF1000,1000_QL80_.jpg "Neoteck Portable 3.5mm Headphone Amplifier with Bluetooth 5.0 Receiver, Two-Stage Gain Switch, HiFi Headset Amplifier, Aluminum Matte Surface [Newest]: Amazon.co.uk: Electronics & Photo")