B00186JQMS Intova PX-21 Compact Slave Camera Flash

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Compact slave strobe with waterproof housing is a perfect solution for extra flash power
Underwater housing depth rated to 200 feet/61 meters
Universal slave strobe can be used with digital or film cameras
Beam Angle approx. 38 degree horizontal and 54 degree vertical
Power: 2 AAA Batteries (not included)