Wrong guesses so far:
- house gate key.
- remote control
- games
- alarm system
- turns on car engine on at specific timing
- temperature detector
- measure car voltage
- USB drive
- kind of plug and play device
Partially right guesses:
- watch
- keychain
- torch
Yes this device has a watch function, its a key chain and has a small LED at the side that functions as a mini-torch... but miss out on the main function of this device...so oni partially correct. | 
