Sea and Sea YS-01 Strobe w/ Grip Stay-S Includes: Grip Stay-S Basic Set, YS-01 Strobe head [Guide Number (ISO 100/m) (land)] 20 [Beam Angle] 100x 100 (with diffuser 110x110) [Batteries] 4xAA A: 6V Ni-MH: 4.8V [Number of Flashes*1] A: 230 Ni-MH: 330 [Recycle time (full)*2] A: 2.5 sec. Ni-MH: 1.9 sec. [Color temperature] 5600K [Depth rating] 75m / 250ft [Dimensions (WxHxD)] 68x108x129mm / 2.7x4.3x5.2inch [Underwater weight] -10g / -0.4oz