Features:
Support CANON/NIKON wireless TTL flash system:
Support Canon wireless TTL flash system (to receive the 580EX II， ST-E2 and Canon7D， 60D， 600D， etc. camera flash signal). Support the Nikon wireless TTL Creative Lighting System CLS(to receive SB-700/800/900， SU-800 and camera command function).
Power zoom function:
24 ~ 180MM focal length adjustment by manual， to capture special moments easier.
High guide number:
GN 35 (ISO 100， 35mm focal length); GN 50 (ISO 100，180 mm focal length).
Fast recycling time:
When use of Ni-Mh rechargeable batteries (Ni-MH)， to complete charging for only two seconds (1/1 output level); when use of alkaline batteries， to complete charging for only five seconds.
Large capacity electrical storage system:
Equipped with OLOONG 1400UF 360V high-quality capacitors and import charging and discharging chips， formed into a strong power supply and electricity storage systems.
Sound monitoring system:
When capture the wonderful scene， the sound monitoring system of SP-660II would prompt you the status， just to know "charging complete" “Flash completed” "low battery warning” “xenon lamp overheating protection" by your ears. You can also turn off this feature in a quiet occasion temporarily.
High-definition LCD and LED backlit:
HD LCD displays clearer and complete information to you， the operation and flash status would be more directly. LED backlit help you use at night， which is more convenient and smaller power consumption.
Xenon lamp overheating protection system:
SP-660II flashlight is with overheat protection system for you. It enters the overheat protection mode automatically when the temperature sensing system senses that the xenon lamp reaches a certain high temperature; In addition， the SP-660II enters overheating protection mode when the number of continuous firing beyond 25 times at 1/1 level. The double protection has an effect on extending the life of the flashlight.
High-temperature insulation:
SP-660II flashlight connects the high-temperature insulation glass in front of the xenon lamp， so that the high temperature is isolated， and ensure that its light transmission is not affected and flash effect is perfect.
Metal mounting foot:
SP-660II flashlight use pure copper metal mounting foot design， effective solute the wear and tear of the mounting foot caused by demolishment， and it is more solid.
Light lead flashing system.
Support multi-speedlight application (F1/F2 lead flashing mode).

TTL compatible: Compatible with Nikon SB-700/800/900， SU-800，OLOONG 690II(for Nikon)
Compatible with Canon 600D， 60D， 7D / 580EXII， ST-E2
Applicable to other manual features: compatible with Pentax， Olympus， Canon， Nikon SLR

Specifications:
Type: On-camera， single contact flashlight
Guide NO.: GN50(at 180mm focal length， ISO100)
Flash coverage: Manual zoom 24-180mm
Display type: LCD display & LED Backlit
Power supply: 4 * AA size batteries(Alkaline & Ni-MH & Lion) (not included)
Flash time: 1/800 - 1/20000s
Recycle time: Approx 2s(AA Ni-MH cell used); Approx 5s(AA alkaline cell used)
Color Temperature: 5600K
Flash control: 22 Level Light quantity output control(1/1 - 1/128， 14 levels of fine tuning)
Power Saving: Auto power off after 3minutes in stand-by mode.
Vertical rotation angle: -7⊂ - 90⊂
Horizontal rotation angle: 0⊂ - 270⊂
Item dimensions: 196.5 * 77.5 * 58.5mm/ 7.7 * 3.1 * 2.3in(L * W * H)
Net weight: 405g/ 14.3oz
Package dimensions: Approx. 23 * 12.5 * 9.8cm/ 9.1 * 4.9 * 3.9in
Package weight: Approx. 689g/ 1.518Lb

Package list:
1 * SP-660II Speedlight
1 * Soft Case
1 * Flash Stand
1 * Flash Diffuser
1 * User Manual