This production intercom HD-903 half duplex interface comes without a power supply. It's a great option for those who already have a suitable power source. Just focus on the interface function without the need to worry about an extra power supply.

To use this production intercom HD-903 half duplex interface, first make sure you have a proper power supply. Connect the interface to your production intercom system as instructed. When using it, avoid placing it in wet or dusty environments. For maintenance, keep it clean with a dry cloth regularly. If there are any problems, check the connections first.