HIKVISION iDS-9664NXI-I8/16S - Chapter 11 Hot Spare Device Backup; 11.1 Set Working Device; 11.2 Set Hot Spare Device; 11.3 Manage Hot Spare System

Network Video Recorder Quick Start Guide
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Figure 3-11 Playback Interface
Step 4 Select the channel(s) to or execute simultaneous playback of multiple channels.