It is a model TK103a is a good device, I have more than 100 installed and work perfectly, son a highly recommended model.
But you can also get it cheaper and original by Aliexpress.com, I send them to ask for that page.
Thanks I found it for £12 free postage from China looking forward to give it a try with trac car
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F152929096212
I'm about to purchase a device and wondering what people's opinions of this are
It looks good with twin antenna and various sensor inputs