Feature: 1. 1. Touch plane, support horizontal and vertical scroll. 2. 2. Comfortable to fit the nature 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: 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 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 Note: Photoelectric resolution: 1600 (dpi) Number of keys: 2 (keys) Interface: Bluetooth Adjustable resolution: four gears Wheel direction: touch wheel Package included: 1 * Folding Bluetooth Mouse