?Two transmission ways£¬ optic transmission and 2.4G wireless transmission£¬ better to meet your needs.<br> <br> Features:<br> Powerful flash with guide number 60m at ISO 100.<br> Supports multiple flash modes M/TTL/Multi.<br> Support high speed sync£¬ 1st curtain snyc and 2nd curtain sync£¬ the maximum shutter sync is up to 1/8000s.<br> Support optic transmission£¬ as a master unit£¬ it can control other speedlights£¬ such as for Canon 580EXII£¬ 600EX-RT via optical pulse signal; as a slave unit£¬ it can receive signals from for 580EXII£¬ 600EX-RT and internal flashing orders from Canon 7D/6D/600D ect.<br> Support 2.4G wireless radio system£¬ can be used as on-camera master unit and slave unit£¬ compatible with speedlite TT685C£¬ Godox X1C£¬ X1T-C and X1R-C flash triggers.<br> The 2.4G wireless triggering distance can reach up to 100m£¬ better to meet your needs.<br> Support FEC/ FEB/ FE lock.<br> Multiple flash groups£¬ it supports A/B/C groups.<br> Supports auto and manual zoom£¬ the flash coverage can be changed between 20-200mm.<br> Sync port and USB port.<br> <br> Specifications:          Model        TT685C       <br>       Type       <br>       Compatible Cameras        for Canon EOS Cameras(E-TTL II auotflash)       <br>       Guide Number        GN 60m(ISO 100)       <br>       Zoom Range        20-200mm auto and manual zoom(14mm with wide panel)       <br>       Adjustable Flash Head        0~360¡ãhorizontally and -7¡ã~90¡ã vertically       <br>       Flash Duration        1/300 to 1/20000 seconds       <br>       Exposure Control               <br>       Exposure Control System        E-TTL autoflash and manual flash       <br>       FEC(Flash Exposure Compensation)         Support Manual.FEB:(1/3rd increments¡À3stops)<br> (Manual FEC and FEB can be combined)<br>        <br>       FE Lock        With &lt;FEL&gt; button or &lt;*&gt; button       <br>       Sync Mode        High speed sync / 1st curtain sync / 2nd curtain sync       <br>       HSS        up to 1/8000s       <br>       Flash Mode        E-TTL /M /Multi       <br>       Wireless Flash(optic and 2.4G)       <br>       Wireless Flash Function        Master£¬ Slave£¬ Off       <br>       Controllable Slave Groups        3(A/B/C)       <br>       Transmission distance(approx.)        Optic         Indoors:12 to 15m<br> Outdoors:8 to 10m<br>        <br>       2.4G        100m       <br>       Channels        Optic        4(1£¬2£¬3 and 4)       <br>               2.4G        4(1-32)       <br>       Slave-ready indicator        Two red indicators blink       <br>       Auto Focus Assist Beam       <br>       Effective Range(approx.)        Center:0.6m-10m       <br>       Periphery:0.6m-5m       <br>       Power Supply        4 * AA Alkaline or NIMH battery(Not included)       <br>       Recycle Time        Approx 0.1-2.6s       <br>       Sync Triggering Mode        Hotshoe£¬3.5mm sync line£¬ wireless control port       <br>       Color Temperature        5600¡À200K       <br>       Dimension       <br>       Item Weight        412g / 14.6oz       <br>       Item Size        19 * 7.5 * 5.0cm / 7.5 * 3.0 * 2.0in       <br>       Package Weight        556g / 19.6oz       <br>       Package Size        20 * 9 * 8cm / 7.9 * 3.5 * 3.1in       <br>    <br> <br> Package List:<br> 1 * Speedlite<br> 1 * Carrying Bag<br> 1 * User's Manual(Chinese /English)<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>