The powerful red beam, compact with key-chain design makes it ideal for professional use.
| Model No. | LK21 |
| Beam Colour | Red |
| Wavelength (nm) | 640-660 |
| Range (ft) | 1500 |
| Power output | Class 3A <5mW |
| Battery type | AAA size x 1 |
| Design | Keychain size |
| Size (mm) | 100.3xÆ13.0 |
| Wt (g) | 40.0 |
| Bar Code | 6925781 440361 |