Features: 1.Onboard high fidelity NS8002 power amplifier chip 2.Support volume adjustment function 3.Support headphone interface output 4.Provide a complete supporting information manual (for Micro:bit graphical routines / python routines / routines and user manuals, etc.). 5.Speaker Expansion Board designed for Micro: Bit that turns your Micro: Bit into a music player. specification:This is a speaker expansion board designed for micro:bit that turns it into a music player. It also supports for development board, which is compatible with 3.3V and 5V for boards. 1. Onboard high fidelity NS8002 power amplifier chip 2. Support volume adjustment function 3. Support headphone interface output 4. Provide a complete supporting information manual (for Micro:bit graphical routines / python routines / routines and user manuals, etc.). 5. Speaker Expansion Board designed for Micro: Bit that turns your Micro: Bit into a music player. : Working voltage: 2.0V ~ 5.5V Hole diameter: Approx. 3.2mm / 0.1in Size: approx. 4.4 * 3.7cm / 1.7 * 1.5in Weight: approx. 56g Package list: 1 * Expansion Board 3 * Clip Cable 1 * PH2.0 3PIN Cable Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Development Resources Wiki : www.waveshare.com/wiki/Speaker_for_micro:bit