LED Badge holders - TOF srl

4x8 inch Extra Large Ticket or Credential Holder with 3 Euro Slots SPID-1040

Bluetooth® Low Energy keyring with NTAG213 Tag, LED and alarm button. Replaceable battery, lasting about 2 years. Android app for configuration.

Ingics iBS04 – Keyring w/ NFC and Bluetooth® Low Energy

Badge Holder (with free Pholdr mini & gift) – LHiDS Creative

Sound-Activated LED Badge

SparkFun and the Future of Arduino - News - SparkFun Electronics

4x8 inch Extra Large Ticket or Credential Holder with 3 Euro Slots SPID-1040

TOF srl - Components for dispensing, laboratory, emergency and coffee

IDP Stat ESD Badge Holder - Anti-Static ESD Products

ID Intelligence Smart Guard HSPD-12 Shielded Badge Holder