Quantity: 1set Batteries Not Provided Dimensions: keyboard: 28.5*12*1.6 cm; mouse: 11.2*5.73*2.7 cm Reliable 2.4G wireless connection: A tiny nano-receiver connects both the keyboard and mouse using just one USB port; Pencil-thin, Low-profile, whisper-quiet keys ensure comcompatibletable and smooth typing. Hot keys keep access to applications and media control easily. The Nano-receiver can be found in the battery compartment of the keyboard/mouse. Battery type: Using AAA battery Interface: USB Operating range: 10 meters How to use: 1. Open the package box, then take out the keyboard and mouse.2. There is a battery compartment in the bottom of the keyboard, then open the battery cover, you will see a USB receiver inside, take out it and insert the device you want to connect.3.After take out the usb receiver, then put AAA batteries inside the compartment with correct setting.4. compatible mouse is same with the keyboard, there also a battery compartment on the back of the mouse, open the cover and put AAA battery too withcorrect setting.5. With USB receiver connect succeed, you can enjoy the keyboard and mouse now Note: 1. It works via a USB receiver connecting, so the device you use should have a USB port, or it can not works.2. This keyboard can normal compatible with tablets, but tablet without USB interface, so you cant insert,You need to buy one OTG tieline.