[Limited Edition / Type A]
ATEEZ brings their fourth single in Japan! The title song "Birthday" is their first Japanese original song since "NOT OKAY," released about seven months ago. This single also includes two more Japanese original songs and their instrumental versions, totaling six tracks. This edition features slipcase packaging and comes with a 36-page photo book and a trading card (A) randomly selected from 16 kinds (each featuring a member individually).

[Limited Edition / Type B]
This edition features slipcase packaging and comes with a 36-page photo book and a trading card (B) randomly selected from 16 kinds (each featuring a member individually).

[Regular Edition]
The regular edition comes with a 16-page booklet. First Press Details: A trading card (C) randomly selected from eight kinds (each featuring a member individually). 

[Limited Release / Flash Price Edition]
This edition comes with a trading card (D) randomly selected from eight kinds (each featuring a member individually).