16-600 Bluetooth HiFi Headphone Amp: Supports headphones with 16-600 ohm impedance, helping high-impedance or low-sensitivity headphones perform better by improving volume and sound quality. Compact, lightweight, and portable design allows for easy carrying. Two-Stage Gain Switch & Bass Boost: Enhances signal input to the amplifier circuit for optimal headphone performance. Features a bass boost switch for richer, more detailed bass response, delivering an immersive music experience. Bluetooth & 3.5mm AUX Input: Upgraded HiFi headphone amplifier supports both Bluetooth connectivity and 3.5mm AUX audio input. Capable of delivering clear, high-fidelity stereo sound with low distortion. Easy to Use & Volume Control: Connect the amplifier to your audio source via 3.5mm cable or Bluetooth, then connect to your headphones for seamless audio transmission. Built-in battery and volume control knob allow convenient adjustment directly on the device. Wide Compatibility & Portable Design: Compatible with various digital devices featuring 3.5mm AUX output, including MP3 players, smartphones, tablets, and computers. Type-C port supports charging and connectivity with compatible devices. Material: Aluminum alloy Color: Black Package Contents: 1 x Headphone Amplifier 1 x USB Cable 1 x Audio Cable 1 x English User Manual Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3 cm.