*2.4G WIRELESS
*SILENT BUTTON
*WATERPROOF DESIGN
*PLUG NAD PLAY
*AUTOMATIC SLEEP DESIGN
*ALUMINUM ALLOY 3D NON - SLIP ROLLER
*MIRROR GRADIENT DESIGN
*FRONT SIDE MICRO CHARGING INTERFACE DESIGN As quiet as the button is quiet Two color injection molding process without wear Clear without pollution for a long time without discoloration Automatic sleep power saving technology Multimedia shortcut key design Plenty of batteries last long on charge