Until a BT-400/BT-500 remote is Bluetooth-paired, it works in infrared (IR) mode — you must point it directly at the front of the box. Pairing over Bluetooth gives you full-range control.
Open the BuzzTV Smart Remote app and tap "pair bluetooth remote." Note: "paired" is not the same as "connected" — check Android Settings > Remotes & Accessories and confirm it shows connected.
Video: Pair BuzzTV Bluetooth Remotes · IR Remote Pairing.
Hold D-pad Down + 0 for about 4 seconds until it blinks.
Tip: the ARQ 100 does not pair — it uses a USB dongle. Each Bluetooth remote binds to one box at a time.