Beurer BC 21 vs Omron RS4

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BC 21 compared with RS4

	BeurerBC 21	OmronRS4
Overview
Released
Released	–	–
Measuring
Type
Type	Wrist	Wrist
Clinically validated
Clinically validated	–	Yes
Irregular heartbeat detection
Irregular heartbeat detection	Yes	Yes
AFib detection or ECG
AFib detection or ECG	No	No
Method
Method	Automatic oscillometric wrist measurement during deflation. Exact UK item 65046, EAN 4211125650469; SK2 voice-language version. First-sale date unconfirmed	Oscillometric wrist measurement; HEM-6181-E. First on-sale date not established
Accuracy
Accuracy	Exact manual display accuracy ±3 mmHg for systolic and diastolic pressure and ±5% for pulse. Systolic range 60–260 mmHg, diastolic 40–199 mmHg and pulse 40–180 beats/minute; cuff-pressure range 0–300 mmHg is separate	Maker's pressure accuracy ±3 mmHg and pulse accuracy ±5%; systolic range 60–260 mmHg, diastolic 40–215 mmHg and pulse 40–180 beats/minute
Clinical validation
Clinical validation	Exact manual gives an unspecified clinical-test maximum permissible standard deviation of 8 mmHg, without identifying a published study. Medaval reports no peer-reviewed clinical validation information for BC 21, but incorrectly labels its measurement site upper arm; exact maker manual establishes wrist measurement. Independently established headline validation omitted	Medaval attributes STRIDE BP adult self-measurement recommendation to HEM-6181 equivalence, while noting that its unpublished assessment cannot be verified against MDR requirements. Exact manual says pregnancy use has not been validated
Features
Features	Spoken instructions and results in German, English, French, Italian or Turkish for UK item 65046; three volume levels or off. Shared data sheet separately lists item 65040 with English, Spanish, Polish, Arabic and Farsi; those languages are not part of this UK version. Irregular-heartbeat warning, coloured classification scale, date/time, application-error messages and automatic switch-off. No dedicated AFib screening, ECG, movement detection, heart-level position or resting indicator	Wrist-height positioning symbol and locator bars, cuff-wrap, movement, hypertension and irregular-heartbeat indicators; no AFib screening or ECG. Web page calls the guide LED, while the exact manual describes a display symbol
Cuff
Cuff fits
Cuff fits	14–19.5 cm	13.5–21.5 cm
Cuff
Cuff	Attached wrist cuff for 14–19.5 cm circumference. User must position the cuff at heart level; no electronic position guidance	Wrist circumference 13.5–21.5 cm
Connections and memory
Users
Users	2 (better)	1
Readings stored
Readings stored	60 per user	60
Bluetooth and app
Bluetooth and app	No	No
Memory
Memory	Two users with 60 dated readings each; oldest overwritten when full. Average of all stored values and morning (05:00–09:00) or evening (18:00–20:00) readings over the latest seven days. Deletion clears the selected user's entire memory	60 readings for one user; latest two/three readings within ten minutes can be averaged. Four weeks of morning averages, using the first three readings each morning
App
App	No Bluetooth or connection from the monitor. Current Scan & Save support captures displayed values using a smartphone camera into beurer HealthManager Pro; not automatic transfer	No Bluetooth or OMRON connect transfer; a Bluetooth/app composition in the Dutch maker gallery conflicts with the exact manual and product specifications
Power
Power	Two 1.5 V LR03 AAA alkaline batteries; approximately 200 measurements depending on blood pressure and inflation pressure. Battery operation only	Two AAA alkaline batteries included; approximately 300 measurements with new alkaline batteries
Design
Display details
Display details	Non-illuminated LCD with black digits, maker size 3.8 × 4.5 cm. Physical membrane memory and start/stop controls; low-battery indicator. Manual IP22	Digital LCD; IP22
Size
Size	Exact manual and September 2021 data sheet give 87 × 67 × 31 mm (L × W × H) and approximately 105 g without batteries; data sheet specifies cuff included. Current product table instead gives 87 × 67 × 70 mm and 187 g excluding packaging, with weighing conditions unspecified; differences unresolved	Approximately 93 × 62 × 20 mm (W × H × L, excluding cuff); manual gives 86 g without batteries, versus web table's rounded 90 g
In the box
In the box	Monitor with attached cuff, two AAA batteries, storage box and instructions. Current product page also lists a blood pressure record	Monitor, storage case, two AAA batteries and instructions 1/2; UK product page also lists a blood pressure pass