Features 1��1. Touch plane, support horizontal and vertical scroll, left and right keys. 2��2. Comfortable to fit the natural curve of the hand. 3��3. Bluetooth 4.0 connection, lower power consumption, more stable performance and smoother use. 4��4. Bluetooth folding touch. 5��5. Ultra?thin. Specification Model: ZTW-21 folding touch mouse Connection method: Bluetooth 4.0 Wireless frequency: 2.4GHz frequency range Wireless range: about 10 meters Size: 131.2 * 55 * 14.5mm/5.16 * 2.16 * 0.57inch (Approx.) Weight: 82.5g with battery Battery: 2 AAA alkaline batteries Connection with the computer: Bluetooth Applicable models: Notebook computers Photoelectric resolution: 1600 (dpi) Number of keys: 2 (keys) Interface: Bluetooth Adjustable resolution: four gears Wheel direction: touch wheel Package List 1 * Folding Bluetooth Mouse