From their facebook post:
From now till 10 Jan 2020, get our signature small hot Kopi / Teh at only $1!
Promotion is only valid in-store at Toast Box URA Centre #01-02, while stock last! Other terms and conditions applies.
Address: 45 Maxwell Road #01-02 URA Centre S(069188)
Operating Hours: Mon - Fri: 730am to 5pm Sat, Sun & PH: Closed