Alctron HA4 Plus Professional Portable Monitoring Headphone Amplifier

Alctron HA4 Plus Professional Portable Monitoring Headphone Amplifier HA4 PLUS mini headphone amplifier splits a single stereo signal into four headphone outputs. The unique circuitry delivers top-notch sound even in a harsh environment.Each channel comes with its own level control without interaction. Its USB power supply design allows it powered by PC, phone charger, bank charger etc. High quality steel chassis provides extreme durability Features Its USB power supply design allows it powered by PC High quality steel chassis provides extreme durability HA4 PLUS mini headphone amplifier splits a single stereo signal into four headphone outputs Each channel comes with its own level control without interaction Specs Line inputs * Type: 1/4’’ TRS connector, stereo * Impedance: 100kΩ max, 10kΩ min * Max input level: +20dB Headphone outputs * Type: 1/4’’ TRS connector, stereo *  Impedance: 47Ω *  Max output level: 40mW in 100Ω  * Power supply: USB 5V  *  Dimensions: 110mm*60mm*48mm