The BV104 is a USB to serial converter that utilises the SiLabs IC. The actual product is not made by ByVac and so can vary from time to time. In most cases there is a switchable 3.3V and 5V option. See picture below for current version.

The BV104 is always supplied with Dupont connector leads. The actual IC fitted may vary i.e. CP2012/4


This is a constantly changing product but it will always have TX,RX and DTR pins.