Kit compatible with Canon i-TTL flash system perfectly. Features: System type: FSK 2,4GHz wireless remote control system – Distance: up of 100m – Flash mode: i-TTL, M, Multi flash – Sync mode: 1st curtain, 2nd curtain, Hi speed sync – Groups control: 3 Groups a/b/c – Max sync speed: 1/8000s – Compatiable flash: Hot shoe flash, Studio AC flash – Channels: 2 – Shutter interface: 2,5mm port – Studio flash light connect plug: Standard PC output port – Battery: AA x 2 – Stand-by time: 60H – Dimension: 70x60x45 – Weight: 70g each.