Olympic lockers
From London Hackspace Wiki
These are lockers used during the Olympics, with cheap Chinese keypad locks on.
They take 4xAAA batteries, or USB power, and have a reset push button of some sort on the inside.
Some of the locks are glued to the doors.
Casing
MODEL: SN-DJ500 PATENT NO.:200820095244.2
QA sticker is damaged.
Patent belongs to Shenzhen ZFD Industry Co., Ltd.
Board
Chip is painted, but board has sticker on:
PW-206BHT-O C316&A260_v102 P/N:0012 14298
P/N is reprinted variously around the board as S/N.