Feature: 1. Long Lasting Standby: The data cable of the keyboard is a USB interface, which is environmentally friendly and durable, can be recharged repeatedly, and has a built in rechargeable battery for long‑lasting battery life. 2. 1600DPI: Wireless mouse three levels adjustment DPI, 800, 1200, 1600, and ultra thin and ultra quiet, ergonomic design, comfortable feel, 4D keys, more comfortable to use. 3. 12 Fn Keys: Silent keyboard has 12 Fn composite keys, a combination of Fn+F1~F12, which supports common shortcut key functions such as volume, media, mute, and song cutting. 4. Wireless Connection: The keyboard supports BT mode connection, and is compatible with mobile phones, computers, and tablet devices, and can be freely matched with forWindows,for OS X,for Android, etc. 5. Good Rebound Effect: The keyboard keys are designed with a scissor foot structure, which is comfortable to tap, has a good rebound effect, feels comfortable, and is clear and powerful when typing. Specification: Item Type: Keyboard Mouse Combo Material: ABS,Iron Plate Keyboard: Data Line Interface: USB Built in Battery: Lithium ion Battery Battery Capacity: 180mAh Battery Model: YN803040 Limited Range of Operation: Within 10 Meters Connection Method: BT Mouse: Style: Single BT Battery (Delivery Without Receiver) Number of Keys: 4 Keys DPI: 800,1200,1600 Connection Method: BT Use Battery: 1 x AA Battery(Shipped Without Battery). Package List: 1 x Keyboard1 x USB Data Cable1 x Mouse1 x Chinese English and Japanese User Manual (Mouse) Note: Keyboard with built in battery, mouse shipped without battery.