Neewer CT-16 is a wireless remote flash trigger system designed to control and synchronize your camera's flashes. With 16 selectable channels, you can avoid interference and ensure reliable triggering. It operates on a 433MHz frequency and has a range of up to 30 meters outdoors and 20 meters indoors. The transmitter is powered by a 12V 23A lithium-ion battery and the receiver by 3 AAA batteries. The CT-16 supports a sync speed of up to 1/250s and features a hot shoe mount for easy attachment to your camera.