This device does NOT come flashed with Tasmota, as it is a developer board. To flash the Sonoff SV, you will need an FTDI adapter.
Sonoff SV is a low voltage switch. The low voltage light switch supports 5-24V power supply. Power supply separation enables it to control both AC and DC power, although some welding is required for this purpose. It has GIPO reserved to support secondary development. This product does not have 433 RF function and shell.