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
- key finder
- mini chainsaw?? (wa piang, next guess would be a laser stunner!)
Partially right guesses:
- watch
- keychain
- torch
- sensor beacon. Yes it is some kind of a sensor... (another hint)
- has a timer instead of a stopwatch | 
