They have the lead free nuclear testing device.  

All contracts, options, or other devices not based upon a substantial consideration, or that are otherwise employed to permit an unlicensed person to sell, lease, or let real estate, the beneficial title to which has not, in good faith, passed to such party for a substantial consideration, are hereby declared void and ineffective in all cases, suits, or proceedings had or taken under this chapter; however, this section shall not apply to irrevocable gifts, to unconditional contracts to purchase, or to options based upon a substantial consideration actually paid and not subject to any agreements to return or right of return reserved.Then you have 475.42 which states brokering without a license is a 3rd degree felony:475.42 Violations and penalties.—(1) VIOLATIONS.— (a) A person may not operate as a broker or sales associate without being the holder of a valid and current active license therefor.

I’m looking for a noise monitoring device for my STR.

Here in Houston on bigger jobs we have another catchy little device in these transactions.50 down, 50 upon with 10% you hold on to until a negotiated point like 60 days or until scheduled closing date regardless of close...etc.

You can also just consult your internet provider or local tech company (we used a combination of Spectrum Internet for services and wi-fi installation and Best Buy's total tech membership for device installation).

Are you able to change batteries on technology like Ring devices, Smart Locks,smoke detectors, etc.?

I would link to it but am on my mobile device.

As for the leach field, there are ways they can detect those, by doing a radio controlled device flushed down the toilet and following it to see where it goes, etc.

You can buy a self-protection device and some training for the same price and protect you the rest of your life.

The best device I ever bought was a PDA phone.