4 CHANNELS This portable headphone amplifier adopts a 4-channel distribution system with excellent audio quality and allows up to 'up to 4 people to listen to the reading at the same time. It can be used as an audio separation or headphone splitter. SIMPLE STEREO/MONO SWITCHINGThis headphone distribution amplifier can easily control the audio source mono and stereo. It has 5 buttons for easy control. It adopts 1/4 inch and 1/8 inch output, 1/4 inch TRS, 1/8 inch and RCA input, which will meet the using needs. INDEPENDENT VOLUME CONTROLThis mini headphone amplifier designed with independent volume control allows each listener to determine their own volume via a dedicated output volume control knob. Perfect for stage and studio performances or applications COMPACT SIZE This amplifier This stereo headset features a compact mini size and measures 14 x 9.6 x 3 cm / 5.5 x 3.8 x 1.2 inches, making it easy to carry and can be used anytime, anywhere. Or. It is made of iron alloy, the headphone amplifier is sturdy and durable with a non-slip mat at the bottom to keep it stable. 100% QUALITY ASSURANCEWe are very confident in the quality of this amplifier studio headphones and offer warranty or refund. Please do not hesitate to contact us if you have any questions about your purchase. We will resolve your problem within 24 hours.