On board speaker. MEMS Microphone with LED indicator. Touch sensitive logo-in sleep/off mode means the board can be powered-down with batteries connectedDiscrete regulator can supply up to 200mA of current to external accessories RefinementsNotched edge connector. To make it easier to things like and conductive thread LED indicator. In addition to the USB activity indicator, a LED shows whether the -type:bit is powered on or off. To easily identify the radio/Bluetooth componentMemory: 512kB Flash, 128kB RAM Interface: KL27Z, 32kB RAMMicrophone: MEMS microphone and LED indicatorSpeaker: on board speakerLogo touch: touch sensitive logo pinEdge Connector: 25Pin,4 dedicated GPIO, PWM, I2C, SPI and ext. . 3 ring pins for connecting /banana plugs. Notched for easier connection.I2C: Dedicated I2C bus for peripheralsWireless: 2.4Ghz -type: bit Radio/ Bluetooth 5.0: 5V via -USB port, 3V via edge connector or battery pack. LED indicator, off( and hold button)Current available: 200mA available for accessoriesMotion sensor: ST LSM303Software: for C++, Make Code, Python, ScratchMaterial:plasticcolour:blackPackage Contents:1 * Updated -type:bit V2 Development BoardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.