Tablet Bluetooth keyboard combined with protective case, convenient for a business trip The Bluetooth keyboard has a long-lasting button life, is durable to use The keyboard has a built-in lithium battery, convenient to charge and use Can be converted to a supporting stand for hands-free movie watching and web surfing Fine workmanship, and equipped with a backlit so that you can normally use it at night The integrated Bluetooth keyboard case comes with a touchpad, restoring laptop features Slim and lightweight design, convenient for travel, business trips, etc. Specifications: Bluetooth: Bluetooth 5.3 Material: PC+TPU+PU leather Operating Voltage: 3.0-4.2V    Number of keys: 64 keys Continuous working time: ≥ 5 hours    Working current: 8.5-120mA Standby current: 1mA  Low battery alarm: 3.0-3.3V  Battery capacity: 500mAh   Standby time: less than 150 days Key life: 3 million times   Battery life: 3 years Connection distance: ≤ 10 meters    Key strength: 50-70g Charging current: 250mA  Charging Interface: Type-C USB Wake-up time: 2-3 seconds    Charging time: 2-3 hours Random password: None      Operating temperature: -10-55℃