Reolink camera models that support two-way audio are:

Applies to: E1, E1 pro, E1 Zoom, E1 Outdoor Series, Reolink Lumus, RLC-511WA, RLC-523WA, RLC-840WA, RLC-843WA, RLC-540A, RLC-811A, RLC-812A, RLC-823 Series, RLC-824A, RLC-81MA, RLC-81PA, RLC-830A, RLC-833A, RLC-843A, RLC-840A, RLC-1240A, RLC-1212A, RLC-1224A, B1200, D1200, FE-P, FE-W, CX410, CX410W, CX810, Reolink Duo series, Reolink TrackMix series, Reolink Video Doorbell series and all Reolink battery-powered cameras.

Some camera models are discontinued right now, for models on sale, you can order here:

If you want to use the two-way audio of your camera to talk with others, the following are the steps for teaching you how to enable the two-way audio.

Note: Ensure the microphone/speaker could work on your Phone/PC before using the two-way audio.