Hint: Battery powered
The answer to this puzzle is:
1. CAR
2. CHARGER
3. DEVICE
4. CLOCK
5. VEHICLE
6. WELDER
7. FAN
8. DRONE
9. TABLET
10. HEATER
11. TRAIN
12. SPEAKER
2. CHARGER
3. DEVICE
4. CLOCK
5. VEHICLE
6. WELDER
7. FAN
8. DRONE
9. TABLET
10. HEATER
11. TRAIN
12. SPEAKER