## Common ground
Both options refer to professional broadcast decks used in media production and transmission.
## Options at a glance
**8521.90 – Recording on media**
- **Defining trait:** Primarily designed to record video and audio onto removable storage like SD cards or SSDs.
- **Typical examples:** Sony XDCAM, Blackmagic URSA Broadcast, Panasonic AJ-PX400.
- **Best fit when:** The device’s main purpose is capturing and storing media directly on portable drives.
**8543.70 – Control function**
- **Defining trait:** Designed to manage or synchronize other broadcast decks, not primarily for recording.
- **Typical examples:** Remote control units, master sync generators, automation controllers in broadcast studios.
- **Best fit when:** The device is used to coordinate multiple decks or systems, not to record content itself.
## Key differences
| Feature | 8521.90 – Recording on media | 8543.70 – Control function |
|-----------------------|------------------------------------|------------------------------------|
| Primary function | Record and store media | Manage or synchronize other devices |
| Storage involvement | Yes (SD card, SSD) | No (no recording medium used) |
| Use case | Field recording, on-location shoots| Studio automation, broadcast control |
## How to choose
- Does the device record video/audio directly onto SD cards or SSDs? → 8521.90
- Is it used to control or synchronize other decks, not record media? → 8543.70
## Overlaps & pitfalls
A deck may both record and control other devices, but the **main function** determines the correct code. If recording is central, use 8521.90; if control is primary, use 8543.70. Do not assume dual use implies equal weight—choose based on the product’s defining purpose