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Understanding this reply is super late, but I just found my VTO210 in the cupboard, and had a play with it. If you are prepared to run the Dahua 'configtool' app, you can upload .mp3 files of your choice, with a 20kb limit. I've had a problem with a selection or two, but most have gone...

Hi Andy, I'm looking to buy (to dleiver to melbourne) 6 x IPC-HFW1831-E (or perhaps varifocal version IPC-HFW2831T-ZS ) but I notice there is not much stock in your aliexpress store (haven't checked your other stores). Can you quote & advise when available? (I'd need 3 x 2.8mm, 2x 4mm, 1x...