Speak Recognition, Voice Recognition Module V3, compatible with ArduinoProduct FeaturesVoltage: 4.5-5.5V.Current: <40mA.Digital Interface: 5V TTL level for UART interface and GPIO.Analog Interface: 3.5mm mono-channel microphone connector + microphone pin interface.Size: 31mm * 50mm.Product Description*Voltage: 4.5-5.5V. *Current: <40mA. *Digital Interface: 5V TTL level for UART interface and GPIO. *Analog Interface: 3.5mm mono-channel microphone connector + microphone pin interface. *Size: 31mm * 50mm. *Recognition accuracy: 99% (under ideal environment). Feature: *Support maximum 80 voice commands, with each voice 1500ms (one or two words speaking). *Maximum 7 voice commands effective at same time. *Arduino library is supplied. *Easy Control: UART/GPIO. *User-control General Pin Output. Document: *Manual. *Library for Arduino. *Video Instruction. *How to play VR3 with VR3. *How to test VR3 Protocol on PC.