TEN-TAP® Programming – Choice of three user selectable programs: Uses lithium ion battery (P/N 74175); also accepts two 3V CR123A lithium batteries or a commercially available Li-Ion 18650 rechargeable battery. Self-adjusting battery cradle secures multiple battery sizes and eliminates battery rattle. Rechargeable using supplied USB cord or optional AC wall adapter. Durable, anodized aluminum construction; IPX4 water resistant; 1 meter impact resistance tested Water-resistant sliding metal sleeve protects USB port. Anti-roll head, Removable pocket clip; nylon holster included. IPX4 water-resistant; 1 meter impact resistance tested. 16.5 cm 204g