BOXED eTap System, Blip Box User Manual Red eTap Blip BlipBox_ SRAM .
SRAM RED E-TAP Blip Box | Alltricks.com
SRAM eTap AXS Blip Box | Shop at Mercari from Japan! | Buyee bot-online
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