The module I received was marked “485 Relay 2CH V1.1” on the top. There’s a AMS1117-3.3 (www.advanced-monolithic.com) LDO voltage regulator (3.3V), a Shenzhen Hangshun Chip Technology Development ...

The 40-781A-92x (PXI) and 42-781A-92x (PXIe) modules consist of either a single or dual microwave changeover switch payload, capable of switching up to 110 GHz in 50 Ω.

Therefore, when the DS2405's output is open, the relay is engaged. Conversely, when its output is closed, the relay is re-leased. With the indicated values, the oscillation frequency is about 300 kHz.

Pickering 4x-781A-921-LA 110GHz relay configured as a SPDT switch “These modules are particularly applicable to emerging microwave technologies, such as automotive radar, in addition to radar, ...