Feature: 1. SILENT DESIGN: computer mouse is designed to be silent, the keys are silent, not afraid to disturb other people studying, resting. 2. STABLE CONNECTION: Quiet mouse adopts 5.0, more stable connection, less occupying a USB port, portable and stable. 3. FAST CHARGING: mouse has a built in high capacity lithium battery, fast and intelligent charging, safe and faster, long lasting battery life. 4. RELIEVES HAND FATIGUE: Wireless mouse is ergonomically designed to perfectly match the position of each of your fingers and relieve hand fatigue. 5. WIDELY COMPATIBLE: Wireless computer mouse is widely compatible with laptops, PCs, and computers to meet your usage needs. Specification: Item Type: Mouse Material: ABS, Electronic Components Product Size: Approx. 11.4x5.3x2.4cm / 4.5x2.1x0.9in Battery Capacity: 400mAh Shipped With Built In Battery Battery Type: Lithium Battery Package List: 1 x Mouse 1 x English Manual 1 x USB Data Cable Note: Please allow some error due to manual measurement.