The key tag lets you use the keyless locking and unlocking feature. It's smaller and lighter than the standard key, which makes it particularly useful when you have limited space for carrying items.
If you leave the key tag in the vehicle and lock the vehicle with your standard key, the tag will be disabled until the vehicle is unlocked again.
Key tag battery
The battery in the key tag isn't rechargeable and can't be replaced.
Note
A discharged key tag could still be used to start the vehicle via back-up start. For this reason, return any discharged key tag to an authorized Volvo workshop so that it can be deleted from the vehicle's system.
Warning
The key tag includes a non-replaceable battery that can be extremely hazardous. Keep batteries out of reach of children. If you suspect a battery has been ingested or in any way inserted into the body, seek immediate medical attention. Battery fluid is also hazardous, and physical contact with it should be avoided.