BestDealUSA 	 brand new universal hot shoe flash speedlite for Canon rebel Nikon D7000 D5100
This product is compatible with many camera with the standard hot shoe (such as Canon, Nikon, Pentax, Olympus etc.)Power Control    The flash unit has 8 steps of power output control which indicated by 8 pieces of LED lamp for different level.    Press "+" to make power higher and they are 1/128,1/64,1/32,1/16,1/8,1/4,1/2,1/1. Otherwise, press "-" to make power lower.   M Mode  S1 Mode  S2 Mode Power-saving Function    To save battery power, the flash will enter stand-by state in about 30 minutes of idle use.    In S1/S2 mode, the flash will enter stand-by state in about 60 minutes of idle use. Press any button to wake it up.    In Power-saving mode, the charging indicator flickers in every 3 seconds. Other Indicators are turned off. 　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.   Light Quantity Output Control :with 1/8 - stop increment   Color Temperature: 5600K+200K   Flash Duration :1/800s~1/2000s   Dimensions :190*75*55mm   Net Weight :286g     1 X New TT520 Speedlite