This is a numeric keypad that connects via Bluetooth. ● It conforms to Bluetooth(R) 3.0 Class 2 standards and can be used wirelessly without connecting a receiver. ● It has a power ON/OFF switch on the front of the unit. ● It is equipped with a battery level indicator lamp to notify you when it's time to replace the battery. ● No special drivers are needed; simply pair it and it's ready to use. I am selling this because I recently purchased a new one. The batteries are already installed, so you should be able to use it right away. There are some scratches and signs of use, so please be aware of this before purchasing.