JLZT-LINK ZT-RX21W-C3

"ZT-RX21W-V1.1" is silkscreened on the board in the FCC photos.

According to a Differences Description document filed with the FCC, the following models are all internally identical:
 * ZT-RX21W-C3
 * ZT-RX21W-A2
 * ZT-RX21W-B2
 * ZT-RX21W-C3
 * ZT-RX21W-D4
 * ZT-RX22W
 * ZT-RX32W
 * ZT-RX52W
 * ZT-RX62W
 * ZT-RX72W
 * ZT-RX82W
 * ZT-RX92W
 * ZT-RX25W
 * ZT-RX28Q
 * ZT-RX55L
 * ZT-RX58W
 * ZT-RW32X
 * ZT-RW80X
 * ZT-RW85X
 * MCW3
 * MCW8
 * MCW5
 * ME303R