Detailed Answer
Spare parts list (by priority): 1. Battery (2 pcs — biggest risk of work interruption); 2. Transmitter (1 unit — swap on failure); 3. Receiver (1 unit — for critical equipment); 4. Antennas (1 each for transmitter and receiver); 5. Key caps; 6. Sealing rings; 7. Charger. Lider and Xingjia have complete spare parts supply. For critical equipment (metallurgy cranes/port gantry cranes), a complete backup unit is recommended.
| Essential | Battery/transmitter |
| Critical | Receiver |
| Consumables | Antenna/key caps |
Note:Manage a spare parts ledger and check shelf life regularly.