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 AXS 1x Electronic Aero Groupset: AXS BlipBox, 2 Blips, 2 Clics, Rear Derailleur, D1 | Tree Fort Bikes
Mountain Bike Action Bike Hacks: A Better Dropper Seatpost - Mountain Bike Action Magazine
Sram Red Etap Blipbox - Bicycle Derailleur - AliExpress
eTap Blips | ES-EAC-BLIP-A1 | SRAM
eTap AXS BlipBox | ES-EAC-BBOX-D1 | SRAM
eTap AXS Wireless Blips | EC-BLIP-B1 | SRAM
SRAM Red eTap ushers in wireless shifting era - BikeRadar