M1 Portable Amplifier  All aluminum-alloy body and chassis increases metal texture and increases shielding from EM interference
l  New toggle switches and more reliable and easier to read and operate
l  Pre amplifier OPA1642 serves as the voltage amplifier, with great layering and medium and high frequency extension.
l  Power amplifier AD8397 serves as the current amplifier, with great control of low frequencies and smooth drive
l  Fully discrete bass and gain circuit design
l  Can work while charging, 1400mAH built-in battery ensure more than 12hrs of battery life