Looking for a Device That Beeps When Separated (RF, Not Bluetooth)

I'm looking for two small devices that emit a beep when they are separated and stop beeping when they are brought back together. A few key requirements: They should communicate via radio frequency (RF), not Bluetooth or the internet. The range should be between 100 meters and 1 kilometer. I do not want a GPS-based tracker—this is specifically about two devices communicating directly with each other. One device would be attached to a wallet/pouch, while the other would go on a keychain or inside a phone case. So at least one of them should be compact enough to fit between a phone and its case, while the other can be larger if necessary. Ideally, I’d like to avoid building something from scratch. But if no commercial options exist, any DIY solution would need very low power consumption for long battery life. If anyone knows of an existing product that fits these criteria (not a GPS tracker), or has an idea for an efficient DIY approach, I’d love to hear your thoughts! Thanks in advance! submitted by /u/Lunatic_Chick69 [link] [comments]

Mar 17, 2025 - 00:35

I'm looking for two small devices that emit a beep when they are separated and stop beeping when they are brought back together.

A few key requirements:

They should communicate via radio frequency (RF), not Bluetooth or the internet. The range should be between 100 meters and 1 kilometer. I do not want a GPS-based tracker—this is specifically about two devices communicating directly with each other. One device would be attached to a wallet/pouch, while the other would go on a keychain or inside a phone case. So at least one of them should be compact enough to fit between a phone and its case, while the other can be larger if necessary. Ideally, I’d like to avoid building something from scratch. But if no commercial options exist, any DIY solution would need very low power consumption for long battery life.

If anyone knows of an existing product that fits these criteria (not a GPS tracker), or has an idea for an efficient DIY approach, I’d love to hear your thoughts!

Thanks in advance!

submitted by /u/Lunatic_Chick69
[link] [comments]