| International protection (ip) code: | IP66 |
| Adjustable headband: | Jā |
| Vendor homepage: | https://flashlight.nitecore.com/product/nu31 |
| Flashlight type: | Headband flashlight |
| Housing material: | Aluminium,Polycarbonate (PC) |
| Product colour: | Grey |
| Shockproof: | Jā |
| Shockproof up to: | 1 |
| Splash proof: | Jā |
| Waterproof: | Jā |
| Color rendering index (cri): | 90 |
| Flashlight modes: | Flashing mode/High/Low/Medium/SOS mode/Turbo/Ultralow |
| Lamp type: | LED |
| Lamps quantity: | 1 |
| Light beam distance (max): | 145 |
| Light beam distance (min): | 5 |
| Light colour: | Red,White |
| Light output (max): | 550 |
| Light output (min): | 5 |
| Luminous intensity: | 5800 |
| Number of light modes: | 3 |
| Number of power levels: | 5 |
| Battery capacity: | 1800 |
| Battery life (boost mode): | 5 |
| Battery life (max): | 147 |
| Battery technology: | Lithium-Ion (Li-Ion) |
| Battery type: | Built-in battery |
| Battery voltage: | 3.7 |
| Charging source: | USB |
| Input voltage: | 5 |
| Rechargeable battery: | Jā |
| Depth: | 46 |
| Height: | 35.6 |
| Weight: | 95.5 |
| Width: | 62.3 |
| Cables included: | USB |
| Units per shipping box: | 1 |
| Unit calculated volume: | 0.000693 |
| Unit calculated weight: | 0.171 |
| Summary: | Nitecore NU31. Flashlight type: Headband flashlight, Product colour: Grey, Housing material: Aluminium, Polycarbonate (PC). Shockproof up to: 1 m, International Protection (IP) code: IP66. Lamp type: LED, Lamps quantity: 1 lamp(s), Light output (min): 5 lm. Charging source: USB, Battery type: Built-in battery, Battery technology: Lithium-Ion (Li-Ion). Width: 62.3 mm, Depth: 46 mm, Height: 35.6 mm |
| Unit box height: | 0.055 |
| Unit box length: | 0.14 |
| Unit box width: | 0.09 |