Supports manual, TTL, optical slave(s1, s2), stroboscopic mode ,front/rear curtain-sync, overheating protection, automatic sleep mode; Recycle time: Approx.5s; High Guide No.32(ISO 100, 105mm). Built-in highlight LED light can provide the auxiliary lighting for the video clips. Flash can rotate 60 - 90 degree horizontally and -7 - 90 degree vertically, weight about 150g, small and easy to carry. Support ON-Camera and OFF-Camera Flash Triggering , external Micro USB interface can be use as a port to charge the speedlite (must be rechargeable battery) and upgrade the firmware.