The Fujifilm EF20 Shoe Mount Flash for Finepix HS-20 and X100 Cameras is a lightweight, portable on-camera flash with a 20' (6 m) guide number @ ISO 100. It provides coverage for lenses in the 24-105 mm (in 35 mm format) range. An EV Adjust button allows you to increase or decrease brightness when using bounce flash. The flash head rotates 45°, 60°, 75°, and 90° vertically for flexibility in directing your light. The EF20 is intended for use with the Finepix HS-20 and Finepix X100 cameras. It operates on 2x alkaline or 2x NiMH AA batteries. Batteries are not included.