CameraPlus- CPM580 2.1'' LCD display Speedlite Flash (M,Multi,S1,S2) with The Standard Hot Shoe for Canon Nikon Sony Panasonic Olympus Fujifilm Pentax Sigma Minolta Leica and Other SLR Digital SLR Film SLR Cameras and Digital Cameras with single-contact Hot Shoe This CPM580 is compatible with many camera with the standard hot shoe (such as Canon, Nikon, Pentax, Olympus etc.) This flash has a guide number of 33 (ISO 100), a color temperature of 5500k, and 4 AA batteries (Alkaline or Ni-MH are usable) power the unit. The CPM580 vertically rotates 0~90 degrees, and it horizontally rotates 0~270 degrees One flash may last 1/1050s~1/2000s depending on the 1/8 - stop increment selected. One one set of batteries, expect 100-1500 flashes (AA alkaline batteries used) and a recycle time of approx. 0.3-5s (AA alkaline batteries used). Power Management: Switch to the ON, the flash will start charging (the charging indicator is dim). After several seconds, the charging indicator turns red and JY680A is ready to shoot. For a test flash, press the test button. After use, press the ON/OFF to OFF to power off. If the red charging indicator lamp flickers in every 1s, it indicates low battery. In such case, the power will turn off automatically and you need to replace the batteries. Model Switch between: M and Milti; Power Control: . Press set Button, Then Press "up " and down to make power higher or lower and they are 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2, 1/1. Protection Function: Protection in continuous flashes:To prevent the flash head from getting too hot and damage, please do not flash over 20 times when in power lever 1/2,1/1. Please cool down the flash unit for at least 10 minutes. The over-temperature protection function will be activated if you continue to flash after 20 times. In this state the charging time will turn to 10-25s. Please cool down the flash unit around 10 minutes and it will turn to normal state. Systematic over-temperature protection:When the inner circuit is over-heating, which indicates over use of the flash unit, the inner circuit will shut down power automatically. The flash unit will turn to normal state after the inner circuit is cooled down.