Anti-lost and search function Helps protect children or pets from getting lost Helps prevent mobile phones, wallets, or luggage from being misplaced Transmitter: Attach to the item being protected Receiver: Carry with you or keep nearby Functions: 1. Anti-lost function: The receiver will sound an alarm and vibrate when the protected item moves beyond the set distance. 2. Search function: Turn the switch on the receiver to S-ON. When the transmitter is within range, the receiver will alert with sound and vibration as you approach it. If the transmitter is out of range, the LED on the receiver will not flash and no alarm will be triggered. Transmitter battery: 1 x CR2032 (included) Receiver battery: 1 x AAA battery (not included) Color: Black Material: Plastic Package Contents: 1 x Receiver 1 x Transmitter Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.