The device has a built-in silicon label and can be used without a microphone.<br> The lever can be used to switch display modes, and the encoder can be used to control sound effects.<br> When used as a sound effect processor, the device must be powered independently, such as a 220v USB charger or a dedicated 12v input, otherwise it introduce display crosstalk.<br> Made of high-quality materials.<br> Easy to use.<br> Input voltage:USB5V/DC7-24v<br> Input power:1W<br> Frequency response:50Hz-20kHz<br> Sensitivity: 40db (@1kHz)<br> Channel:dual channel/mono switchable<br> Input interface:3.5mm unbalanced/XH2.54-3P<br> Sampling rate:48KHz<br> Input gain adjustment range:-6-+42db<br> Output gain adjustment range:-52-+12db<br> AGC adjustment rate:-3db-27db<br> Pitch range:-8-+8 degrees<br> EQ frequency:logarithmic 15 bands<br> EQ data group:6 presets + 10 personal settings<br> Colour:As Shown<br> Material:Plastic<br> Package Contents:<br> 1 * Audio Spect Analyzer<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.