1、UNIQUE DESIGN: Passive power amplifier speaker selector adopts full isolation without common ground design, safe; multichannel independent relay switching, mute without impact. 2、CIRCUIT GUARD: Passive power amplifier speaker switcher unique electronic tube bilevel amplifier load guard circuit, stable and dependable. 3、PROFESSIONAL: 2 bilevel amplifiers, 2 transistor amplifiers, 2 pairs of speakers; 4 amplifiers, 2 speakers lossless switching (amplifier, speaker guard function). 4、MODULAR INDEPENDENT DESIGN: Passive power amplifier speaker switcher adopts modular independent design. Isolation control and conduction society to eliminate crosstalk. 5、RELAY CONTROL: Passive power amplifier speaker switcher of bipolar allow away circuit. Relay control for both positive and negative. Item Type: Passive Power Amplifier Speaker Switcher Material: Aluminum Alloy Z3DS Host: AC12V Speaker Load Power: <500W Rated Power Remote Control Battery Specification:2 x AAA Battery (Not Included) 1 x Switch 1 x Supply Cord 1 x Instruction Manual 1 x Remote Control