Item Type: Headphone Amplifier Material: Aluminum Alloy Color: Black Battery Model: Lithium battery (built-in) Battery Capacity: 1000 mAh Input/Output Port: 3.5mm port Amplification Time: Approximately 6 hours Load Impedance: 16-600 Ω (can drive the impedance range of headphones) Distortion: 0.002% Signal-to-Noise Ratio: ≥120 dB Output Power: 250 mW in Amplifier Internal Voltage: ±4 V Charging Voltage: DC 5 V Frequency Response: 20 Hz-20 kHz (±3 dB) Parameters: Compatible with a variety of digital devices with 3.5mm AUX output, such as MP3, MP4, mobile phones, for PS4 controllers, etc. Type-C input is compatible with mobile phones, computers, and laptops. The enhanced signal is fed into the headphone amplifier circuit to make the headphones play at their best performance. With a bass switch, it provides a more delicate and round bass performance, giving you a more shocking music experience. 1、3.5mm AUX and Type-C versatility: 3.5mm AUX and USB Type-C ensure a more reliable and stable connection. SNR>120Db and THD+N 0.002% allow for sharper and more realistic stereo sound output without distortion. 2、Wide application: This headphone amplifier is remarkably compatible with a variety of digital devices with 3.5mm AUX output, such as MP3, MP4, phones, for PS4 controllers, and Type-C input is compatible with mobile phone, computer, laptops. 3、16?600 Ω HiFi headphone amplifier: Supports 16?600 Ω impedance, headphone amplifier helps high-impedance or low-sensitivity headphones to be driven better, it is delicate, compact, lightweight, which can be carried comfortably. 4、2-stage gain switch and bass boost: It enhances the signal fed into the amplifier circuit for optimal headphone performance. With a bass switch, it provides a more delicate and smooth bass performance, giving you a more shocking music experience. 5、Volume control and durable shell: There is a knob that allows you to adjust the volume, which is also an on/off switch. Aluminum alloy shell, durable overall shielding reduces signal interference and improves heat resistance. Package Includes: 1 x Headphone Amplifier 1 x 3.5mm Cable 1 x USB Power Cable 1 x Manual Manual measurement has a 1-2cm error.