RF Wireless Key Finder. This model consists of one key ring transmitter and four receivers. This transmitter contains four buttons, an LED light and a key ring attachment. Each button on the transmitter is color coded (green, red, blue and purple) to represent one of the four receivers. The receivers all contain an LED light and key ring attachment. Each of the four receivers are color coded (red, green purple, blue). The output volume of the key ring receiver is 90-95 decibels. The frequency used by the RF Wireless Key Finder is 433.92 MHz and it has a remote distance of 60-80 feet. The transmitter operates on 1 “A27” 12 volt battery which is not included with the item. The receiver operates on 1 button cell battery which is included with the item. All items are packed together ready for retail sale. In use, a key ring receiver would be attached to an item which might be lost or misplaced frequently. When that item is misplaced, the user would use the transmitter to help locate the item. The user would press the appropriate button on the transmitter for two seconds. If the lost article is within range, the receiver would signal the user as to its location by emitting an audible beep and simultaneously flashing its LED light.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N058370