Marginally downsized with high-performance 64mm / 2.5in x 83.1mm / 3.3in x 106.5mm / 4.2in (W x H x D). Successfully designed world smallest body size as 4AA operated underwater strobe (*1) with its optimized inner components layout and trimming off unnecessary space. Best suits with a compact digital camera- supporting digital SLR camera with its mobility- incredible compact size even as dual strobes and high performance. The S-2000 totally changes underwater strobe concepts. (*1) As of March 2009 among 4AA operated underwater TTL strobe (data by INON INC.) Not only compact strobe The "S-2000" is operated by 4 x AA batteries to provide fundamental features of strobe though 4 x AA batteries operation is hostile to downsizing. The same level of basic performance and durability as existing "D-2000" and marvelous high performance is supported with its compact body. Together with powerful and substantial Guide Number 20- the "S-2000" benefits you with ultrafast recycle time and remarkable flash capacity thanks to less inner wiring and efficient component parts. In addition to reliable and super accurate [S-TTL Auto mode] flash control- [12 step Manual mode] supports professional lighting. The EV Controller to make fine adjustment on [S-TTL Auto] and auto-switching function to accommodate with various pre-flash type (2- 3 time pre-flash) digital camera is equipped. Next generation wireless TTL function The "S-2000" strobe has ultra sensitive slave sensor which is 100 times more sensitive comparing to the slave sensor of existing "D-2000" strobe and successfully enables to support wireless [S-TTL Auto] flash control without using an optical cable. Also the sensitivity of the slave sensor dramatically lengthens synch range of Manual flash mode. Supplied "Mirror Unit" effectively corrects master strobe light to enhance exposure control accuracy. It is easy to use wireless S-TTL Auto shooting simply attached on compatible underwater housing via INON Shoe Base or Grip Base D4 (upcoming product). Conventional optical cable connection is also supported to provide 2-way connection method to select either of optical cable or wireless depending on shooting circumstances. Unlimited expandability with optical cable system The "S-2000" strobe is equipped with a connector mount on the front side to receive TTL signal of the strobe. One "S-2000" strobe can be linked to maximum two strobes via optical cables and operate them in [S-TTL Auto mode]. This optical cable system benefits you to add [S-TTL Auto] operating strobe easily by connecting with an optical cable to pick up S-TTL control signal is piched up from your camera system. This expandability makes underwater studio with perfect lighting real. Natural color even with a diffuser The supplied diffuser does not affects light color- which is popular among professional photographers. The color temperature of the "S-2000" changes only 100K(kelvin) by this diffuser. You can have same color tone between macro shooting without diffuser and wide shooting with diffuser to widen strobe beam angle.