I updated the hardware base for my buzzer module. Using a dedicated PCB, the board now has a USB-C connector for charging, a status-LED and a push-button for switching the module on and off. The processor module supports Bluetooth BLE as well as WIFI. This allowed me to add configuration through a browser.
The module is significantly smaller than the predecessor. Therefore, it is more flexible in its appplication. It is ideal for integration in DIY buzzer projects. there are nearly no limits to phantasy when creating fancy buzzers.