Product: Nobsound Little Bear MC22 Mini 2-IN-2-OUT 3.5mm Stereo Audio Switcher Passive Speaker Headphone Manual Selector Splitter Box Audio Sharing (2-IN-2-OUT)
Brand: Douk Audio
Color: Black
Features:
 2-IN-2-OUT (switch audio sources) 
 Input (3.5mm) connections: Computer / Phone / Music player. etc.
 Output (3.5mm) connections: Active speaker / Headphone / Amplifier. etc.
 High quality volume control knob; Smoothly control the volume 
 Mute button; Mute the device with just one key; Very useful for special conditions
 A / B, 1 / 2 both select button; Can conveniently select the device you want to use as the audio input or output
 No power and additional software required
 Hot-swappable (no need to reboot devices)
 Compact and super mini size; Easy to place and suitable for your desktop and office
 
 Parameters:
 Interfaces: 4 * 3.5mm jack
 Knob and key: 1 * volume knob; 1 * A/B selector; 1 * mute botton,1 * 1/2 selector
 Dimensions: 3.23 * 2.17 * 0.79 in
 Weight: 0.22 lb
 
 Packing List:
 1 * audio selector (without audio cable)
2-IN-2-OUT audio selector / splitter / switcher box designed for customers having several audio sources and outputs
How to use: (1)connect two sound sources like computer / CD player with A & B ports; (2)connect two sound outputs like speakers with ① & ② ports
Main functions: (1)select audio input with A/B switcher; (2)select audio output with ①/② switcher
Volume control; One key to mute; Passive device; No power needed; Won't affect sound quality; Super mini size
Volume adjustment may not be gradual if connecting headphones to output port directly. Direct replacement or refund for defective devices. Prompt and courteous customer service.

Search query: 4 channel speaker selector
Relevance: Substitute