Sidewinder Compact II Military Helmet Mount

Purchased several years ago, but due to work circumstances, there were many short periods where I couldn't wear it, so I stopped using it soon after. It has barely been used.
It is no longer needed due to retirement, so I am organizing and listing unwanted items.
Performance details are quoted from the official website↓

Length: 7.62cm (3.00 inches) Width: 2.72 cm (1.07 inches) Depth: 5.21cm (2.04 inches)
Weight: 2.4 oz (68 grams) with CR123A lithium battery (included at purchase).
3.3 oz (94 grams) with CR123A lithium battery and optional helmet mount.
Lens: Impact-resistant polycarbonate lens. Gasket-sealed.
Light Source: High-power C4® LED, white, 50,000-hour lifespan, impact-resistant.
5mm IR LED, peak wavelength 880nm, 100,000-hour lifespan, impact-resistant. 5mm Red LED, peak wavelength 630nm,
100,000-hour lifespan, impact-resistant. 5mm Blue LED, peak wavelength 470nm, 100,000-hour lifespan, impact-resistant. 5mm Green LED,
peak wavelength 527nm, 100,000-hour lifespan, impact-resistant. (Refer to description for LED configuration by model)
Lumen Output: White C4® LED (with CR123A): 55 lumens, 1,175 candela peak beam intensity, 69m beam distance.
High (100) White C4® LED (with AA battery): 47 lumens, 1,000 candela peak beam intensity, 63m beam distance.
5mm IR LED: 25mW/sr (minimum) radiant intensity.
5mm Red LED: 1.5 lumens, 60 candela peak beam intensity, 15m beam distance.
5mm Blue LED: 1.8 lumens, 130 candela peak beam intensity, 23m beam distance.