The Voice recognition module can recognize your voice. It receives configuration commands or responds through serial port interface. With this module, we can control the car or other electrical devices by voice. This module can store up to 15 pieces of voice instruction. Features: Voltage: 4.5-5.5V ? Current: <40mA ? Digital Interface: 5VTTL level UART interface and GPIO ? Analog Interface: 3.5mm mono-channel microphone connector + microphone pin interface ? Size: 30mm x 47.5mm ? Recognition accuracy: 99% (under ideal environment)