Flex 4ES
Four (4) single-speed pushbuttons

Flex 4EX
Four (4) dual-speed pushbuttons

Flex 8ES
Eight (8) single-speed pushbuttons

Flex 8EX
Eight (8) dual-speed pushbuttons

Flex 12ES
Twelve (12) single-speed pushbuttons

Flex 12EX
Twelve (12) dual-speed pushbuttons

Compact Receiver (Flex 4 models)
Up to 9 outputs

Standard Receiver (Flex 8 & 12 models)
Up to 26 outputs