This module has two main functions, The first function is the analog signal followed by the op amp, suitable for A/D conversion; The second function is the switch signal, which can set the current limit value in advance. When the actual current value is the preset current value, the switch signal change from low level to high level, and the LED indicator indicates. Easy to use. 1. Power supply voltage: 3-5V, 5V is recommended; 2. Power current: 3.5mA; 3. Operating temperature: -20 - 125 ; 4. Isolation voltage: 1.5kV; 5. Detection current range: -100A-100A; 6. Linearity: 20mV/A 7. Limited current range: 1.5A-100A; 8. Board size: 30mmx37mm with 4 M3 fixed mounting holes Specification: WCS1800 Colour:As Shown Material:plastic+metal Package Contents: 1 * module Only the above package content, other products are not included. 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.