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Bought too many! These are new OEM and come in a plastic bag with a pre-terminated male 4-terminal Deutsch DT connector, and are programmed with J1939 at 250 kbps.
I can change them to CANopen which is CANBUS mode or change the J1939 speed if you let me know in the comments. It might add a day or two to shipping.
CANopen is available in:
1 Mbit/s500 kbit/s250 kbit/s125 kbit/s50 kbit/s20 kbit/s
J1939 is available in 500 kbit/s in addition to 250 kbit/s (default).
Blink Marine PKP-2600-SI — 12-Button CAN Keypad (2×6), IP67
Confirmed compatible with these ECUs, PDMs, and dashes:
Documented / native support
• AiM PDM08 and PDM32 — configured in Race Studio 3 (12-button keypads use CAN IDs 0x19, 0x1A, 0x1B, 0x1C; up to 4 keypads on the CAN2 stream at matching bitrate) 
• AiM MXG / MXS / MXP dashes on CAN2
• ECUmaster PMU16 and PMU24, plus EMU Black / EMU Pro — fully open CAN, works with standard or extended (J1939) addressing 
• MoTeC PDM15 / PDM30 / PDM32 and C125 / C127 / C185 dashes — Blink keypads can be configured to emulate a Grayhill (MoTeC) keypad 
• MaxxECU STREET / PRO / RACE — native CAN keypad integration over J1939; keypads sold by MaxxECU ship pre-programmed for J1939 
• Link ECU G4X (Xtreme, Fury, Thunder, Storm) — Link ECUs support up to two CAN keypads configured directly in PCLink Also later g5 ecus. 
• Hardwire Electronics PDM25 / PDM50
• MicroPDM — requires standard firmware (not Blink’s motorsport firmware), CANopen, 1 Mbit/sec, node ID 15 
Manufacturer-listed compatibility
Blink Marine states that because the keypads use standard CANopen and J1939, they communicate with any PDM, and specifically names ECUmaster, Link ECU, Life Racing, MaxxECU, Haltech, AiM, Plex Tuning, AEM, and ProEFI.  Retailers also list Bosch Motorsport PBX and Emtron  among supported systems.
Anything else with open CAN
Emtron KV/SL series, Syvecs, Life Racing, Plex, AEM Infinity, ProEFI, Racepak SmartWire, and any dash, logger, or PDM that accepts user-defined CAN messages.
Buyer note: This unit is currently configured for [CANopen / J1939], bitrate [500 kbit / 1 Mbit], node ID [0x__]. Protocol, baud rate, LED behavior, and node ID are all reprogrammable over CAN using Blink Marine’s free published configuration procedure — the unit is not locked to any one brand.