FindiT Ultra Portable Credit Card Size Wireless Key Finder 130 feet max working range backed by a powerful, safe 433Mhz radio frequency Improved technology reduces false alarms triggered by other devices A simple slide activates beeping sound and flashing light on the receiver Slim, credit card sized transmitter is easy to carry in your wallet, purse or pocket If item becomes defective within 12 months. A replacement will be shipped free of charge.