OBO HANDSEnglish Rfid NFC Copier Reader Writer duplicator 10 Frequency Programmer with color screen +5pcs T5577 em4305 cards+5Pcs UID key

Doesn't work at all. waste of time and money. going to return

There are multiple problems with this device. I'm going to go through every single one and hopefully save you $50So starting where credit is due. This device did read every card I gave it. That is the only thing that it can do. READ cards.When trying to write cards it will only write to the white cards that come with the reader. The blue fobs will fail to write no matter what you do.The blue fobs do work when trying to wright to them using MIFARE classic (an app for nfc compatible phones) but the reader refuses to write.Next is something shown in the pictures promoting this product. It shows connecting the device to a computer and using some software that comes with the device. Now the computer does detect the device, but it can't read from the device at all. I tried 3 different micro USB cables and not once did the file explorer show me the device. I tried it in both Windows and Linux and nothing. I eventually found the software on a 3ed party sight (I confirmed it was the same one shown on the promotional pictures), but it was in Chinese, and the real kicker was that the software didn't detect the reader at all.Now we have a problem, the reader has no way of giving you the information of any card that it read other than the flat white ones. It's is extremely limiting and downright unacceptable at this price tag.But I'm not done, this device loves to talk, and whenever you do ANYTHING it will tell you what it's going, reading a card will have it readout the card id and failing to write to a card will have it say "writing failed". This wouldn't be a problem if there was a mute button.... But there isn't a mute button. The ONLY way to get it to stop talking is by opening the reader up, and cutting a speaker wire.Appon opening the device you will notice that the nfc coil is plainly hot glued to the housing and soldered directly into the motherboard, and if you aren't careful those to hairthin wire will break off.The front isn't much better with the screen insecure so when you open the case the screen flops wherever it want to go.All in all its a terrible device, I was looking for a simple handheld device just to copy and paste nfc cards, but this device can't Handel this simple task. Please save your money and consider a different reader.

easy to use

it worked for copying my keyfob. (I used 125khz rewritable T5577 Sticker Coin) Shipping was blazing fast. Build is pretty shoddy as many others have pointed out. No matter. Does its job, I'm satisfied with it.

First off, I saw this product from different sellers for about $20 more but with much better ratings. This seems to be an identical product so I wouldn't let the ratings scare you. In fact, I think poor ratings on a lot of RFID duplicator products on Amazon are from a lack of understanding of RFID transponders and receivers, which is why I'll try to elucidate those concepts here.The transponder (card or fob) is a passive device that gets its power when inductively coupled with the receiver. The product featured here is a receiver and so are the scanners on buildings/doors that read your transponder. In order for a receiver to communicate successfully with a transponder, it must (1) use the correct frequency and (2) know the rules for how the signal will be modulated to send data back and forth. This is where card types come into play and I think where most people might have issues.While there are a variety of physical card brands out there, the compatibility of any transponder will depend on the actual chip inside the card. This product includes 5 key fobs that use EM4305 chips. I haven't been able to confirm if the cards use the same chip. I believe this corresponds to the ID-125 kHz setting on the reader/writer. For my application, I wanted to duplicate an HID ProxCard. With a little research, I found that these cards use T55x7 chips so I ordered some and was able to copy them very easily using the HID-125 kHz setting.There are a ton of other frequency settings between 125 kHz and 1000 kHz but I don't think there are any actual transponders that use these frequencies so I'm having a hard time understanding the purpose. Even if some new transponders in this frequency range become mainstream, it is unlikely that this receiver would be able to communicate with them unless they use the same protocol as current common chips. Also, the voice broadcast feature is annoying and probably unlikely to improve accessibility for vision-impaired.I did really like that you can power it with usb if you don't want to use batteries.Short recommendation: Know the IC chip that drives the transponder you wish to read/duplicate. Then you verify that this receiver can read it and you can get the correct blank transponders for making duplicates (if they aren't the same as the ones included).