-SPECIFICATIONS- Model :SUREFIRE‐KL3+Z3+Z48 Custom WaterResist Length :202mm Width :36mm Weight :250g (With three CR123A cells) Water resist :At least 30m Run time : <6 Volt> The curve on the Beam Lumen Output graph indicates a drop in output after 4 hours for the KL3 using a 6 volt battery. However, useable light is available for more than 9 hours. <9 Volt> The curve on the Beam Lumen Output graph indicates a drop in output after 7 hours using a 9 volt battery. However, useable light is available for more than 15 hours.