The phottix laso transmitter can control and trigger 5 groups 15 units of canon compatible radio enabled flashes and supports multiple flash modes including e ttl iie ttl manual multi exta and linked shooting 24 ghz frequency 100m range 15 channels with digital id af assist light controls and triggers canon compatible radio enabled flash items include phottix laso transmitter 1 pc bag 1pc aa battery 2 pcs usb cable 1 pc manual 1 pc warranty card 1 pc qc