Features: XTR-16 of USB connector wireless power-control flash receiver is designed with 2.4G wireless X-system. It can be compatible with TTL wireless trigger X1 series Transmitter to trigger flash. It incorporates multiple functions, such as high-speed sync, and can realize TTL flashes and non-TTL flashes combined use. Very convenient for photographer to adjust the lighting. Fit flash for Witstro AD360 AD180 outdoor flash, Quicker, Quicker D, QT, QS, Gemini GT, Gemini GS, DE, and DP series studio flashes. Specifications: Mode: XTR-16 Connector: USB Item Size: 5.5 * 3 * 2cm / 2.1 * 1.1 * 0.7in Item Weight: 18g / 0.6oz Package Size: 6 * 3 * 2.5cm / 2.3 * 1.1 * 1in Package Weight: 21g / 0.7oz Package List: 1 * XTR-16 Receiver Note: When you use the XT Series Receiver combined with X1 series Transmitter, please set the X1 transmitter to M mode. XTR16S cant deal with the parameters when the X1 Transmitter in TTL and Multi modes. Trigger the studio strobe flash without regulating power.