This is an adapter for a video game console.
From the manufacturer:
Compatible models include: New 3DS, New 3DSLL, 3DS, 3DS LL, New 2DS LL, 2DS, PS Vita, Nintendo Classic Mini Family Computer, Nintendo Classic Mini Super Nintendo, Smartphone, iPhone
- Input: 100 to 240 V, 50/60 Hz
- Output: DC 5 V, 1 A
- Weight: Approximately 32 g
- Size: about 52.7 mm × 38.8 mm × 17.4 mm