Official licensed product, Accurate combination of 1000, 1250, 1750 Dpi resolution, Built-in Automatic shut-off timer, Low battery indicator, Blue-Eye technology for more accuracy and less power consumption, Functioning head lights and rear lights, Maximum operation working distance of 30 meters (under no interference circumstance), Nano receiver and storable slot for easy carrying. With on-off switch for head lights and rear lights to save power. Compatible with Windows and MAC. Package content: AA battery 1 piece, USB receiver 1 piece, User manual 1 pieceShen Zhen Shi Lai Mai Si Ke Ji You Xian Gong Si