TWO INDICATOR LIGHTS: The PEMENOL voice module has two indicator lights, respectively pointing to the state of power supply and playback. This will be very helpful for you to observe the working status of the voice module, convenient operation..9 WAY TRIGGER PORT: PEMENOL voice playing module is designed with 9 way high pressure and high temperature resistant trigger ports. Without programming, you can directly connect the trigger button to realize a variety of playing modes, such as single cycle, sequential play, etc..WARNING DEVICE: PEMENOL Voice Broadcast Device can be connected with external buzzer or light alarm. It can be used as the alarm device for families, supermarkets and warehouses. You can freely change the alarm effect or sound you want..VOLUME ADJUSTMENT UPPER LIMIT: PEMENOL MP3 Music Player can not only adjust the volume with the button, but also set the upper limit of adjustable volume by adjusting the potentiometer..30W HIGH POWER: The voice playing module is a 30W high power module with better sound quality, which can be used in DIY Bluetooth speakers or various DIY electronic kits to widely meet your needs.