1) Model: S48 (charger seated) 2) Performance: underwater, explosion protection, shock resistant, tactile switch, 2 shifts of brightness, over-discharging protection 3) Battery: 6V, 3.5Ah (nickel-hydrogen battery) 4) Continuous illumination hours: 2 - 4 (16W halogen bulb) 5) Can afford to under deep water for a long time