Features: Voice Recognition Module is easy control speaking recognition board. This product is a speaker-dependent voice recognition module. It supports up to 80 voice commands in all. 7 voice commands could work at the same time. Any sound could be trained as command. Users need to train the module first before let it recognizing any voice command. This board have 2 controlling ways: Serial Port (full function), General Input Pin (part of function). General Output Pin board could generate several kind while corresponding voice command is recognized. Voice commands are stored in one large group like a library. Any 7 voice commands in the library could be imported into recognizer. It means 7 commands are effective at the same time. Specifications: Voltages: 4.5-5.5V Current: <40mA Digital Interfaces: 5V level for UART interfaces and GPIO Recognition accuracy: 99% (under environment) Size:Approx.31x50mm/1.22x1.96inch Package Includes: 1 Set Voice Recognition Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.