BrandEarldomMaterialABS, PCBluetooth version5.3Built-in microphone for conversationhas itinput voltage12-24 voltsOutput voltage/currentUSB: 5V=2.4A / USB-C: 5V=3A – 9V=2.77A / PPS: 3.3-5.9V = 3.A – 3.3-11.0V=2.25ANumber of ports3 NumberPort typeUSB, Type-CRadio frequency (FM wave)87.5-108 MHzDescription of portsOne USB-A port for flash connection up to 32 GB / one USB-A port and one USB-C port for chargingOther featuresIt has music management buttons / call volume adjustment roll