Question about Sharp DR-P420

Wouldn't you have to use rechargeable batteries with a USB charging cable? Is nowhere to be seen! MfG

The device cannot be charged via an integrated rechargeable battery, but is powered either by 4 AA batteries (1.5 V) or via a micro USB cable. It is therefore possible to operate the radio with batteries and use it outdoors without having to connect it to a power socket. However, there is no internal battery for charging and wireless operation.