Convoy M21H vs Emisar D4S size comparison
The Emisar D4S is 25.8 mm (1.02 in) shorter than the Convoy M21H, and 1 mm narrower at its widest point.
The Emisar D4S is 25.8 mm (1.02 in) shorter than the Convoy M21H, and 1 mm narrower at its widest point.
Dimensions
| Convoy M21H Check price ↗ | Emisar D4S Check price ↗ | |
| Length | 130.8 mm (5.15 in) | 105 mm (4.13 in)−25.8 mm |
| Head / width | 40 mm (1.57 in) | 39 mm (1.54 in)−1 mm |
| Body | 27 mm (1.06 in) | 32 mm (1.26 in)+5 mm |
| Tail | 28.5 mm (1.12 in) | — |
| Weight | — | — |
| Battery | 21700 | 26650 |
| Max output | — | 4,300 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | from $44.95 at nealsgadgets.com, as of Nov 4, 2026 | not verified yet |
| Source | nealsgadgets.com sourced | nealsgadgets.com sourced |
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M21H vs D4S: how they differ
Size and weight
The Emisar D4S is the shorter light: 105 mm (4.13 in) against 130.8 mm (5.15 in), a difference of 25.8 mm (20%). At its widest point the Emisar D4S is 1 mm slimmer (39 vs 40 mm).
Brightness and throw
The Emisar D4S is rated at 4,300 lm; we have no published maximum for the Convoy M21H.
Battery
The Convoy M21H runs on a removable 21700 battery; the Emisar D4S runs on a removable 26650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 26650 about 26 × 65 mm (nominal).
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Emisar D4S if you want a shorter light (25.8 mm shorter). On the specs we track, the Emisar D4S is ahead or level everywhere; the Convoy M21H 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 M21H Check price ↗ Emisar D4S
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21H vs D4S FAQ
Which is smaller, the Convoy M21H or the Emisar D4S?
The Emisar D4S is the shorter light: 105 mm (4.13 in) against 130.8 mm (5.15 in), a difference of 25.8 mm (20%). At its widest point the Emisar D4S is 1 mm slimmer (39 vs 40 mm).
Do the Convoy M21H and Emisar D4S use the same battery?
The Convoy M21H runs on a removable 21700 battery; the Emisar D4S runs on a removable 26650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 26650 about 26 × 65 mm (nominal).
Compare Convoy M21H with similar lights
Compare Emisar D4S with similar lights
More
Sources
- Convoy M21H: specs from manufacturer published specs as listed by nealsgadgets.com. Price from $44.95 from nealsgadgets.com, checked Nov 4, 2026; prices change often.
- Emisar D4S: specs from manufacturer published specs as listed by nealsgadgets.com. No verified price yet.
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