Bluetooth Numeric Keypad Portable Wireless Bluetooth 19-Key Mechanical Number Pad Keyboard for Smartphone Tablet iPad Mac Laptop Desktop PC Surface Pro with Android Windows iMac iOS

To reset it, press the enter and num lock keys at the same time. A green light should show up and now you can pair it. If you have trouble, press the enter key and the minus key to pair an IOS device. It's a little bit finicky to set up but it did work. The directions were poorly translated so I used google translate to translate the Chinese instructions and it actually worked better than their translation. Good luck!

Could not get it to work with Windows 10.