feature: Input voltage: DC5V Frequency response: 200-18KHZ Number of channels: two channels Only 4mm thick Support 8 display modes, 3-5v can be The new version is here, using ARM CortexM4 core STM32F4 processor (the old product uses M0 core mono), 8M bit rate high-speed display! Compatible with dual channel, level meter. Style: A caseless model/B cased model Size: x 3cm Material: ABS Color: photo color Package Contents: A: 1 x Spectral Display Analyzer B: 1 x Spectral Display Analyzer+1*Case Only the above package contents, other products are not included. Note: Different lighting and screens may cause the color of the item in the picture to be slightly different from the actual item. Measurement tolerance is +/- 1-3 cm.