Samsung Galaxy Fit 4 Appears in FCC Filing With Bluetooth 5.4

FCC documents show the device’s physical schematics and a Bluetooth 5.4 radio, which points to a modest, connectivity-focused refresh for Samsung’s low-cost fitness tracker line.

Overview

Federal Communications Commission filings list a Samsung wearable with model number SM-R391 and label FIT4, providing the primary confirmed evidence for a Galaxy Fit 4 device.
The FCC schematic shows a rectangular display, a single button on the right edge, an optical heart-rate sensor on the back, pogo-pin charging contacts, and a quick-release band mechanism.
Radio data in the filing lists Bluetooth 5.4 with Low Energy and EDR, an incremental upgrade over the previous Fit model’s Bluetooth 5.3 that may improve wireless stability and efficiency.
Samsung has not officially announced the product, and the filings do not disclose software features, pricing, or a launch date so those elements remain unconfirmed in current reporting.
The Fit series targets budget-conscious fitness-tracker buyers and typically receives modest hardware and connectivity updates, so the FCC reveal suggests an evolutionary update rather than a major platform change.