We have temporarily disabled Razer Chroma support due to a common client crash. This functionality will be enabled in a future patch.

No. The Razer Chroma API for Overwatch enables select compatible Razer branded keyboards, mice, LED strips, headsets with LED lighting to display in colors related to hero pick and provide special lighting on keys related to cooldowns down to show when they are ready. See the gif below:

Please note that Razer Synapse and all related features to keybinding overrides, mouse DPI and bindings, etc should not be affected by this.