Ikelite Strobe DS-161 TTL Underwater Flash with Li-on Battery and Smart Charger 4061.1 Includes high-capacity lithium-ion battery and smart charger! Li-ion battery technology produces over 450 full power flashes at a quick 1.4 second recycle time. 300 foot / 90 meter depth rating Built-in 500 lumen video light Near neutral buoyancy in salt water