Retro mechanical keyboard with built-in 2000mA battery for wireless use - Long-lasting power: inbuilt 2000mA battery supports up to 16 hours of wireless control and operation, reducing the need for frequent charging. - Durable and wear-resistant: constructed from impact-resistant material to ensure high wear resistance over time. - Easy multi-device operation: Bluetooth 5.0 supports 3 devices with FN master control for convenient switching between devices. - Practical and adjustable design: built-in notebook and phone holder with adjustable light brightness for versatile use. Use scenarios - Home or office work: pair with multiple devices and switch between them quickly using the FN master control, keeping your workspace tidy and cable-free. - Travel or remote work: portable wireless keyboard with a long-lasting battery, ideal for on-the-go productivity without needing a power outlet. - Late-night or dim environments: adjustable light brightness helps you see the keyboard clearly without disturbing others. This description preserves the product’s retro mechanical design, battery capability, wear-resistant construction, Bluetooth 5.0 connectivity, 3-device support, FN control, and the notebook/phone holder with adjustable lighting.