Hello Dave, 
Sorry to hear you only feel the Phione device is worth a three star review.  To activate the Nefertitys authentification please follow the belpw step: 
Pranan Technologies has developed NEFERTITYS – Near Field Authentication System – a new anti-piracy system that guarantees the authenticity of the Pranan devices.
All Pranan devices have a built-in system that enables users to check their authenticity with their cell phone. Just put your phone near the Nefertitys system at the back of the device and a certificate of authenticity will appear which you can register by clicking the green button. Your device will then be registered and the certificate will assign it a unique alphanumeric code.
You can read the certificate as often as you want and using any cell phone you like. TO activate this system simply: 
Before you begin...
Identify your device: Confirm that you own a 'Nefertitys' device from Pranan (Phione). 
Locate the NFC antenna: The Nefertitys system is found on the back of the device.
Enable NFC: On your smartphone, enable the NFC feature. This is typically in the Settings menu under Connected Devices, Connections, or a similar subheading.
Ensure internet access: Your phone must have an active internet connection (either Wi-Fi or mobile data) to register the device. 
Step-by-step activation guide:
Bring the phone near the device. With NFC enabled and an internet connection active, place your phone near the back of the Nefertitys device.
Wait for the certificate. A certificate of authenticity will automatically appear on your phone's screen.
Register the device. Click the green button on the certificate screen to register your device and assign it a unique alphanumeric code. 
How to deactivate the certificate
If the certificate repeatedly activates, you can prevent this by either: 
Disabling NFC: Turn off your phone's NFC feature in the settings.
Changing placement: Place the Nefertitys device near the base of your phone
I hope ths helps explain the proceedure to you in simple enough language to preform the task.  
PLEASE NOTE - THIS IS NOT A NECESSARY STEP to use a Pranan device - it is simply a way to authenticate that your device is an authentic PRANAN TECHNOLOGIES device.  It has nothing to do with the 'workings' of the device.   
As for the radiation blisters on your hand - I have never heard of this before.  Upon my research & discussion with EMF specialists about this - here is what is found: 
EMF radiation from cell towers and electronic devices, like cell phones & other similar devices, has not been shown to cause blisters on human skin. Blisters are typically associated with high-dose exposure to ionizing radiation, not the non-ionizing radiofrequency (RF) energy from wireless devices. 
Nature of EMF: The EMF radiation from these devices is non-ionizing, meaning it doesn't have enough energy to damage DNA in the same way that ionizing radiation (like X-rays or gamma rays) does, such as physical damage to the skin. 
Acute radiation syndrome: Blisters and other severe skin injuries like erythema are symptoms of acute radiation syndrome, which results from exposure to high doses of ionizing radiation, not from the RF energy of a cell phone or cell tower. 
Other potential skin issues: While EMF radiation doesn't cause blisters, some people report skin issues like redness or tingling they associate with cell phone use. Other, unrelated skin conditions are also possible. (<This could explain the source of your hands' buzzing sensation)  
Below is some information & suggestions to help with this 'buzzing' sensation issue: 
For sensations like tingling or buzzing in the hands when using electronic devices, medical experts suggest that the cause is likely not electromagnetic field (EMF) radiation. The feeling is more commonly associated with musculoskeletal issues related to posture and repetitive strain, or potentially with electrical grounding problems in certain devices. 
Potential causes of a buzzing sensation - Repetitive strain injuries (RSI): Conditions like carpal tunnel syndrome can be aggravated by holding a phone or other device for extended periods. The repeated motions and awkward wrist positions can compress the nerves in your hand, leading to numbness and tingling.
Cubital tunnel syndrome ('cell phone elbow'): This occurs when the ulnar nerve, which runs behind your elbow to your hand, is compressed. Holding your elbow bent at a 90-degree angle for a long time can cause tingling in your ring and pinky fingers.
Grounding issues: If a device with a metal casing (like a laptop) is not properly grounded, you may feel a slight buzzing sensation when you touch it. This is caused by a small electrical current.
How to mitigate the sensation:
Modify your phone habits to protect your hands and wrists: 
Change your posture. Hold your phone at eye level to avoid bending your neck. Switch hands often to prevent overworking the muscles and tendons in one hand.
Keep your wrists neutral. Avoid keeping your wrists bent for long periods. Put your phone on a stand or lay it down on a surface instead of gripping it.
Use hands-free options. Use a headset or the speakerphone feature to avoid holding your phone pressed against your head. For typing, use voice-to-text to give your hands a break.
Take regular breaks. Rest your hands frequently during long sessions of texting or scrolling.
Stretch your hands and wrists. Perform gentle stretches to improve blood circulation and relieve muscle tension. You can extend your fingers, rotate your wrists, and press your palms together in a 'prayer' position. 
Address possible electrical interference:
If you notice a buzzing from a device with a metal casing, make sure it is plugged into a properly grounded outlet.
If you are using an HDMI cable or other accessory, test with a higher-quality, better-shielded version.
Consider having an electrician check your home wiring if you suspect grounding issues. 
Turn off the vibrate function on your phone to reduce the psychological association between phone alerts and the sensation. 
I sincerely hope this helps with your EMF issues.  And that you eventually find the Pranan device(s) to be worthy of more than 3 stars.  
Be well!
Jesse Scott
PrananEMF Manager