Specifications: Interface: USB 2.4G connector Chip: Imported 2.4G wireless chip (more stable and faster connection) Type: Thin, wireless/silent Button: Mute button Button structure: Scissor buttons Keyboard battery: 2 AA batteries (not included) Mouse battery: 1 AA battery (not included) Automatic sleep time: 5 minutes Keyboard size: 367 * 140 * 20mm Mouse size: 115 * 65 * 30 millimeters Packaging: 1 * Wireless keyboard and mouse combination 1 * USB receiver (keyboard and mouse use the same USB receiver) (USB receiver inside keyboard or mouse) How to use our product? Just plug the USB receiver (inside the mouse) into the computer, and the keyboard and mouse can work together. Why is there no light at the bottom of the mouse? The design of the mouse is without lighting, so it won't disturb anyone at night. What if the keyboard and mouse don't work? For keyboards: 1. Connect the USB receiver to the computer (check if the computer can recognize the USB receiver) 2. Place the battery on the keyboard, turn on the power, place the keyboard close to the USB receiver, and then press Esc and K simultaneously for 1-2 seconds. For the mouse: 1. Connect the USB receiver to the computer (check if the computer can recognize the USB receiver) 2. Place the battery on the mouse (it is best to install the battery several times), place the mouse near the USB receiver, turn on the power, and then it can work.