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 can¡¯t deal with the parameters when the X1 Transmitter in TTL and Multi modes. Trigger the studio strobe flash without regulating power.