Item features:

• Compatible with Pentax P-TTL, A YN585EX supports receiving wireless signal from the master unit of AF-360FGZ, AF540FGZ II and other Pentax cameras. It also supports 4 channels, off-camera TTL and manual flash. 
• Completely Support TTL Function, YN585EX supports FEC, FEB, Rear-curtain Sync and Red Eye Reduction.
• TTL flash with High Guide Number, GN58@ ISO100，105mm；supports TTL, M and MULTI mode.
• Multiple Trigger Synchronous Mode Supported, wireless triggered by the built-in flash or master flash, or triggered in S1/S2 pre-flash avoidance mode.
• Firmware Upgrade, USB port accepts to download the latest firmware and upgrade the speedlite by YONGNUO official website 
• Zoom Range: 20-105mm, Supports auto and manual zooming, the flash can coverage can be changed between 20~ 105mm.
• Ultra-fast Charging Recycle System, Recycle time for up to 4-5seconds and full-output recycle time even just takes 3 seconds. 
• Display real-time remaining battery power, YN585EX supports to display remaining battery power in real time. 
• Sound Prompting System
• Different sound indicates the flash mode which adds additional convenience, AF-assist beam for focusing under low light or low-contrast conditions
• Advanced Options Settings and Auto Save settings
• Equipped with Big Size LCD Display Screen, Standard PC synchronous Interface

Item specification:

• Compatibility: suit for Pentax T-PPL like AF-360FGZ, AF540FGZ II, etc.
• Guide Number: GN58@ ISO100，105mm
• Zoom Range: 20-105mm
• Recycle time: 3-5 seconds
• Function: Master/Slave/S1/S2/ TTL/M/ Multi Mode 
• AF-assist beam: Yes
• Firmware Upgrade: Yes