The device has a nice appearance. It works in two power modes: either only from the main power or only from batteries. If you connect it to the main power without removing the batteries, it will work, but the batteries will fail, since there is always a voltage of 6.8 V on the battery compartment terminals when the device is connected to the main power. The manufacturer's technical support confirmed the absence of a charging module for the battery. Power consumption when powered from a DC power in 5 V: maximum 0.908 A, minimum 0.124 A. Inside the case there are 2 speakers of 3 W, 4 Ohm. The quality of the speakers is average. The range of reproduced frequencies is medium and high, there are no low frequencies. In the FM range reception mode, the receiver has good power, it works even with the folded antenna. The WiFi antenna is also quite powerful. The instructions lack characteristics for frequencies, loads and a description of all the icons on the display. The settings are not complicated, I figured it out quickly. There is enough space inside the case to install a 10A*h power bank, which I did.