Make your own bluetooth speaker software app with the Arduino IDE (come with full working examples) no need to bother with the complex ESPRESSIF tool chain. Airplay, Bluetooth, Logitech media server, SD card mp3 play 2x5W stereo output 1 jack input 1 USB-C charging port 1 mems microphones 3 buttons 1 programmable RGB led 1 18650 Rechargeable Battery 1200mAh 1 grove extension port dimensions : 23 x 8 x 6cm weight : 560g