Convoy S21E vs Emisar D4K size comparison
The Emisar D4K is 13.4 mm (0.53 in) shorter than the Convoy S21E, and 0.7 mm wider at its widest point. It is 30 g lighter (without battery).
The Emisar D4K is 13.4 mm (0.53 in) shorter than the Convoy S21E, and 0.7 mm wider at its widest point. It is 30 g lighter (without battery).
Dimensions
| Convoy S21E Check price ↗ | Emisar D4K Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 103 mm (4.06 in)−13.4 mm |
| Head / width | 27.3 mm (1.07 in) | 28 mm (1.10 in)+0.7 mm |
| Body | 27.3 mm (1.07 in) | 26.5 mm (1.04 in)−0.8 mm |
| Weight | 88 g without battery | 58 g without battery−30 g |
| Battery | 21700 | 21700 |
| Max output | — | — |
| Throw | — | — |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | $39.69 at intl-outdoor.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | intl-outdoor.com sourced Output depends on LED option |
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S21E vs D4K: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 116.4 mm (4.58 in), a difference of 13.4 mm (12%). At its widest point the Convoy S21E is 0.7 mm slimmer (27.3 vs 28 mm). The Emisar D4K is 30 g lighter (58 g vs 88 g, without battery).
Brightness and throw
Output for the Convoy S21E and Emisar D4K depends on the LED option chosen.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Emisar D4K $39.69 at intl-outdoor.com, so the Convoy S21E cost $11.70 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Emisar D4K if you want a shorter light (13.4 mm shorter) and less weight (30 g lighter). On the specs we track, the Emisar D4K is ahead or level everywhere; the Convoy S21E makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy S21E Check price ↗ Emisar D4K
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S21E vs D4K FAQ
Which is smaller, the Convoy S21E or the Emisar D4K?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 116.4 mm (4.58 in), a difference of 13.4 mm (12%). At its widest point the Convoy S21E is 0.7 mm slimmer (27.3 vs 28 mm). The Emisar D4K is 30 g lighter (58 g vs 88 g, without battery).
Which is cheaper, the Convoy S21E or the Emisar D4K?
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Emisar D4K $39.69 at intl-outdoor.com, so the Convoy S21E cost $11.70 less. Prices change often, so check the current price before you buy.
Do the Convoy S21E and Emisar D4K use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Convoy S21E with similar lights
Compare Emisar D4K with similar lights
More
Sources
- Convoy S21E: specs from manufacturer published specs as listed by flashlightgo.com. Price from $27.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Emisar D4K: specs from Emisar product page (manufacturer). Price $39.69 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
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