ThinkPad Lock on Leave can work

ThinkPad Lock on Leave

Lock on Leave for the ThinkPad P14s Gen 4 is well hidden!

• Windows Presence Sensing is not supported.
• Instead, Lenovo provides its own Lock on Leave feature.
• Locking may not be reliable in some environments, like noisy cafes!
• Lenovo documentation is not correct! 
• Expanded How To in Lenovo Community.
• Likely applies to T14 Gen 4, P14s Gen 4, T16 Gen 2, P16s Gen 2.
• It may also apply to P14s Gen 5 and P16s Gen 3.

How to enable Lenovo Lock on Leave

1. In BIOS Settings → Security → Intelligent Security → enable User Presence Sensing.
2. In Commercial Vantage (from Microsoft Store) → Device Settings → Smart Assist → enable Zero touch lock.

Windows Settings 

1. Use Default settings in Windows Balanced Power Plan.
2. Set Screen Saver to (None) because it is redundant and possibly counterproductive.

What actually happens

• ~20 seconds of no presence → screen dims
• ~10 seconds later → screen blanks & locks
• No wake‑on‑return, but Windows Hello can activate and unlock on a keypress
• Invisible: no tray icon, no indicator, no tuning

How it works

• Uses speakers to emit ultrasonic pulses
• Uses microphones to read reflections
• Elliptic’s AI model decides “present” vs “absent”
• No dedicated hardware sensor, no FRU

Side effect
Some users can hear the ultrasonic chirps due to:

• speaker distortion
• harmonics
• individual high‑frequency sensitivity

If you hear it, you’re not imagining it.

Guest Network Isolation

Guest Network Isolation

Guest Network Segregation May Be Just Theater

• Guest Network matters.
• Never give your local network credentials (password) to guests. 
• Guest Network must be true isolation,
  not just a 2nd network name (SSID).
• Without isolation:
• The very real threat is credential sharing (which often happens casually).
• Guest network can give the world access to all your networked devices.
• That can facilitate identity theft, accidental or deliberate.
• ASUS gets this right:
• Guests cannot access your local networked devices.
• Guests cannot see each other.
• Guests cannot cross sub-networks.
• If your router does not enforce that, then it does not have a real guest network.

How To Safely Share a Wireless Printer

• Tell your guest to use AirPrint or Wi-Fi Direct.

How to Safely Share a Wireless TV

• Tell your guest to use AirPlay or Miracast. 

How To Test Guest Network Isolation

1. Power on all devices (computers, printers, phones, smart home) on your local network (wired and wireless).
2. Connect to your Guest Network with an Apple or Android smartphone.
3. Install and Run Fing from the appropriate app store (Apple, Google, Microsoft).
4. If you see more than 1 device (your phone) in the Devices tab, the Guest Network is not isolated.

 

Powered Toothbrush Bargain

Li-ion Rechargeable AA Batteries

Li-ion rechargeable AA battery is the secret!

There are many different powered toothbrushes on the market, ranging from inexpensive battery powered to expensive rechargeable models.

In truth, there is no meaningful difference in cleaning action between the best inexpensive battery powered models with fresh batteries and the expensive rechargeable models. The principal difference is the power source.

Inexpensive battery powered toothbrushes typically use disposable AA or AAA batteries, an ongoing cost and waste issue. Worse, as the disposable battery discharges, the voltage drops and the toothbrush slows down.

Oral-B 3D Battery Toothbrush

The solution is to use the latest Li-ion technology in standard AA format, ideally with USB-C recharging!

• Constant battery voltage = constant brushing power 
• High battery power capacity
• Long battery life (1,000 recharges)
• Quick, convenient battery recharging 
• Li-ion tech is superior to older NiMH (and NiCd) tech

Recommended Products

1. Oral-B 3D White Battery Toothbrush 
2. CARDIENS AA USB rechargeable batteries 
3. Toothpaste Worth the Money 

Moral: Why spend $100-$200 instead of only $10-$20?!

Toothpaste Worth the Money

Colgate Optic White

The Toothpaste Gimmick

Most "whitening" toothpastes on the market are a marketing illusion. They don't bleach away stains—they just clean with mild abrasives.

Colgate Optic White (Advanced & Pro Series) is what actually works:

• Real Whitening: Uses hydrogen peroxide to safely bleach away stains.
• 5% Pro: Powerful starter. One tube is all you need.
• 2% Advanced: Perfect for ongoing use.
• No Oral Health Compromise: Includes cleaning agents and cavity protection.
• Smart Tube Design: Engineered to keep out air for better product and less waste.

Moral: Pay for actual chemistry and tube design, not marketing fluff.

p.s. Don't fall for the Colgate Optic White Pro Series Powered Toothbrush—
it's not as good as the Oral-B 3D White Battery Toothbrush.

Amazon Pricing Alert

Amazon Pricing

Amazon pricing is increasingly a ripoff

Real example: Mann engine air filter for 2008 Volvo S60 2.5T:

• FCP Euro: $18.43
• Amazon:*  $24.95 (35% more)

 * Sold and shipped by Amazon, not a 3rd party. 

Amazon's Dynamic Pricing 

• Demand pricing: Boosts prices for return buyers or strong demand
• Location pricing: Charges more if you are in an affluent area.
• Prime premium: Folds shipping cost into prices. 
• Project Nessie: Secret testing of how much it could charge. 

Moral: Always price check!

 

USB-C Cable Conundrum

USB-IF logo

USB-IF Certification is Important

You need a new USB-C to USB-C cable, but you don't want just any old cable. You want:

1. Soft and flexible
2. Solid and reliable 
3. 60W fast charging

And you don't want it to crap out quickly. 

The problem is that so many reasonably priced USB-C cables not only fail to measure up to those criteria, but also that so few (even top brands) are certified USB-IF (USB Implementers Forum), important because it ensures that cables meet strict performance and safety standards.  If a cable doesn't have the official USB-IF logo on it, it's not certified.

The good news is that you can easily find certified USB-C cables on Amazon under Amazon Basics branding, e.g., Amazon Basics USB-C to USB-C 2.0 Fast Charging Cable, 60W, 480Mbps Speed, USB-IF Certified

• USB-IF Certifed 
• Various lengths 
• High quality 
• Low cost
• Black or white

Important Notes:

1. Watch out for counterfeits, especially no name cables. You can check here.
2. Watch out for "fast charging" cables that are only 15W.
3. 60W cables are powerful enough for most purposes and tend to be more flexible than 100W.
4. Faster cables (> USB 2.0) tend to be less flexible and may not be needed.