Advanced HiFi Amplification: Experience superior sound quality with our headphone amplifier that supports high impedance headphones ranging from 16-300Ω. Featuring a 3.5mm AUX input and output, it boasts a signal-to-noise ratio 100Db and a + N of 0.0003%, ensuring a pristine, noise-free audio experience. Seamless Bluetooth 5.0 Integration: form your wired headphones, earphones, or speakers into high-fidelity sound systems with our Bluetooth 5.0 receiver. This technology delivers studio-quality audio wirelessly, enhancing your listening experience without the clutter of cables. Long-Lasting Rechargeable Battery: Equipped with a lithium battery, our amplifier provides up to 13 hours of uninterrupted audio playback. The convenient volume control knob allows for easy adjustments to suit your listening preferences, ensuring a audio experience. Enhanced Audio Dynamics with Two-Stage Gain Switch: Optimize your audio input with the two-stage gain switch that adjusts the amp circuit for headphone performance. Enjoy louder, clearer, and more realistic stereo sound without any distortion, enhancing every detail of your music. Universal Device Compatibility: Our amplifier is designed to work seamlessly with a wide range of digital devices including MP3 players, MP4 players, smartphones, computers, CD players, and personal media players. This versatility ensures you can enjoy enhanced sound quality from nearly any audio source. Color: As Shown Material: Metal Package Contents: 1 * Amplifier 1 * Power cable 1 * Connection cable Only the above package content, other products are not included. Note: Light reflection 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.