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All new appearance All aluminium alloy body and chassis increases metal texture and increases shielding from EM interference. Visual operation experience New toggle switches are mo re reliable and easier to read and operate. Improved sound performance Pre amplifier OPA1642:serves as the voltage amplifier, with great layering and medium and high frequency extension. Power amplifier AD8397: serves as the current amplifier, with great control of low frequencies and smooth drive. Fully discrete bass circuit design Bass on: Boosts bass effect without influencing the overall sound field Bass off : By passes bass circuit, decreases interference and noise floor so as to ensure the purity of the sound quality. Reinforced battery capacity Can work while charging, 1400mAh built-in battery ensures more than 16hrs of battery life. Specifications Power supply Mini USB port Maximum USB port 270mW (32Ohms= THD 16h Drive ability 16 ~ 150Ohm Weight 92g (with battery) Dimensions 91.2mm x 56mm x 13mm Show more