Do not buy Sonicwall 1874 transceiver
Updated: 5/17/23 They were on holiday when I requested support. I have now been refunded for my purchase. So they are legit and trustworthy. Original: 4/23/23 The Sonicwall 1874 compatible transceiver is not compatible with the Sonicwall TZ570P. I've requested help twice and have not been contacted. I've called multiple times and there is no one answering the phone. Optcore has no support and should not be trusted.