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.