National Emergency Light Flashlight Set of 2 Emergency Preparedness Goods It is recommended to install these in each room for disaster preparedness. We have plenty in stock, so if you'd like to buy in bulk, please let us know in the comments. Automatically lights up when removed from the holder Krypton bulb Uses 2 size D batteries Battery life: Approximately 18 hours (approximately 8 hours at 20°C) Size: Main body: Approximately maximum diameter 40mm x 175mm Holder: Approximately width 45mm x 210mm x 55mm Weight: Approximately 280g The case will be slightly folded and shipped via Takkyubin Compact.