The XT-16 Wireless Power-Control Flash Trigger and Transmitter 2.4G provides remote activation, as well as eight power control levels for selected flashes equipped with the XTR-16 receiver. It features a reliable 2.4 GHz radio frequency system with an impressive range of 328', along with a choice of 16 channels. Users can synchronize at speeds up to 1/250 second and there are multiple power control settings for working with speedlights or studio flashes. Additionally, it operates with two convenient AA batteries.