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Product Parameter: 1.Operating distance: 10 meters 2.Modulation system: GFSK 3.Working voltage: 3.3-4.2 V 4.Working current: 10-150 mA 5.Charging current: 250 mA 6.Standby time: 180 days 7.Continuous working time: 5 millions strokes 12.Operating temperature: -10±55℃ Product Feature: Wireless connection without password, easy to use. Leather keyboard cover, stylish design with all-around protection. 7 vibrant backlit colors, change the color you like anytime. Super thin and light, very portable and comfortable. Support enery-saving sleep mode.