Feature: 1. Wide Compatibility: This headphone amplifier supports a wide range of high impedance headphones. With 3.5mm AUX input and output, it ensures clear o quality and reduces noise, allowing you to enjoy enhanced sound performance. 2. Two-Stage Gain Switch: This headphone amplifier boosts the signal from the input to the amplifier circuit, enabling optimal headphone performance. It delivers louder output with clearer, more detailed stereo sound and minimal distortion. 3. Rechargeable Lithium Battery: Equipped with a built-in 1500mAh rechargeable lithium battery, this amplifier provides over 8 hours of continuous use. It includes a volume control knob for easy adjustment. 4. Portable and Lightweight: Designed for portability, this amplifier allows you to enjoy high-quality o on the go. The durable aluminum alloy casing offers long-term reliability. 5. Broad Device Compatibility: Compatible with various digital devices including MP3 players, MP4 players, smartphones, computers, CD players, and personal media players, making it suitable for multiple o setups. Specification: Item Type: o Amplifier Material: ABS Built-in Lithium Polymer Battery: 1500 mAh SNR: 120 dB Output Power: 2000 mW, 16 Ohms Package List: 1 x o Amplifier 1 x USB Cable 1 x o Cable 1 x User Manual