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Yongnuo CTR-301P Wireless Flash Trigger - Transmitter and ReceiverThe Yongnuo CTR-301P is a firm favourite with strobists - a 4 channel, 433MHz radio flash trigger with 20m range, PC sync port, and offering optical and radio triggering methods.
The Yongnuo CTR-301P is an upgraded version of the popular CTR-301 - the main difference being the addition of a PC sync port where the "test" button was previously located.
The Yongnuo CTR-301P offers two triggering methods:
Wireless Remote Control: "W" Mode
Using 433mHz radio frequency (4 channels available) to communicate between the transmitter and the receivers. The transmitter wirelessly trigger flash units attached to the receivers.
Optical Triggering: "L" Mode
A built-in optical sensor in each receiver detects the light produced by the main flash and triggers the slave flash attached to the receiver. Multiple receivers can be triggered by the main flash. Not recommended for outdoor use or in bright conditions.
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