Big Blue Nano The Nano is Big Blues most compact light. It's compact size and light weight makes it ideal for scuba divers and free divers who want to: - Mount it on a mask strap (mask attachment available as optional extra)- Mount it on a cray loop (cray loop attachment available as optional extra)- Store in a pocket as a backup The Nano 600 is great as a backup light or as a low output white light. The light comes with a 14500 rechargeable lithium-ion battery that is recharged through a USB-C port in the battery. So you can use any USB-C cable to charge it. It can also be run on a AA battery in which case the output drops to about 1/3 of the output on the lithium battery. This can be quite useful if you want less light. Specifications: Output Levels and Runtimes Nano 600: 600 lm / 75 mins Beam Angle 10 degree Depth Rating 100m Battery 14500 li-ion or AA NiCd/NiMH Battery Capacity 1000 mAh Charge Time Approx. 2 hours Weight 90g (with battery) Size 114 x 26mm Warranty 1 year Included Light, battery (with USB-C charging port), USB-C cable,wrist lanyard and spare o-rings