Store 1000 fingerprints,Quick identification and comparison. High precision sensor,Pixels 208x288 pixels. Dual communication interface,More convenient to apply. Please note that this type of product is not for ordinary users. It must have a single-chip microcomputer. Otherwise, it cannot be used and may burn out the product. Hign-concerned Chemical:None Model Number:R304A Interface:USB and UART Fingerprint module size:20.4x33.4 (mm) Effective collection area:12x17.5 (mm) Fingerprint capacity:1000 Voltage:DC 4.2-6.0V Sensing array:208x288 pixel Colour:As Shown Material:PCB Package Contents: 1set * 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.