CYW20735 HID & mic (for voice) example is available in WICED SDK. Please refer to demos available in SDK : /20735-B1_Bluetooth/apps/demo/hid
CYW20735 doesn't support audio streaming Refer : WICED Bluetooth Software Features
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Please refer to the SDK 6.2.1, there is a ble_remote demo under demo/hid/ble_remote which shows the mic and HID usage.
You can get the SDK: WICED Studio Wi-Fi/Combo Docs & Downloads