LyxPro STP10 Compact 4 Channel Headphone Amplifier 1/4" and 3.5mm (Mini 1/8") Stereo Mono & RCA Inputs, Clean Amplifier Circuit, Power On LED, for Home & Studio 4 Output Channels Each with Individual Volume Control Stereo & RCA Inputs includes 4 pieces 1/4" to 3.5mm (1/8") adapters LED indicator when the power is on Can be switched between Mono & Stereo Can be Daisy Chained to Multiple Units