Easy-to-use flash with professional features and outstanding build quality. Reliable and fun to use at a much lower price than the rest. 58 m guide number for a powerful flash. Contains a built-in flip-up wide-angle flash diffuser and reflector panel. Charging socket for external power supply: adds a charging socket for external power supply. PC sync port: Easy to use PC sync port. Features a memory function and power-saving mode. Wireless activation sensor Recycle time 3 seconds (with 4 AA alkaline batteries) Supports multi-flash lighting application (S1/S2 mode) Accurate brightness control Supports synchronous front curtain Automatic temperature detection for overheating protection Flash modes: TTL, M, MULTI Wireless trigger distance: 20-25 m indoors, 10-15 m outdoors Vertical rotation angle: 0-90 degrees Horizontal rotation angle: 0-270 degrees Power supply: 4 AA batteries. Alkaline or rechargeable Ni-MH batteries are recommended. Batteries are not included. Colour temperature: 5600 K