SRAM launches Red eTap wireless groupset | road.cc
SRAM eTap BlipBox [00.7018.235.000] at TriSports
eTap BlipBox | ES-EAC-BBOX-A1 | SRAM | Service
Bent Up Cycles - SRAM etap blip box. Technically, you only need this and don't need the blips. But I have found that shifting with the blips by the brake levers works
SRAM Red eTap Blip Dummy Plug Shifter/Blip Box Pair – The Bike Hub