Package content: Bluetooth keyboard, USB charging cable, user manual, cylinder packaging 3.0 Applicable systems: IOS system, Android system, and window system are common to all three systems. Mobile phones, tablets, and computers can be used after Bluetooth connection. Bluetooth Silicone Keyboard Features: 1. Number of keys: 87 keys. 2. Fully sealed design, waterproof, dustproof, oilproof, anti-corrosion, can be used in any harsh environment, can be cleaned in water, disinfected with cleaning solution, so that germs have nowhere to hide. 3. It can be curled and stuffed into the bag at will, easy to carry, save space, and personalize the keyboard. 4. Mute, silent percussion, can achieve complete silence, not afraid of affecting family sleep. 5. Good hand feeling, soft and flexible buttons, good mute effect 6. This keyboard is suitable for Bluetooth devices such as mobile phones and tablets. It can also be used for notebooks and desktops when paired with a Bluetooth adapter 7. The keyboard can be fully charged in about 2-3 hours, and it can work continuously for about 35 hours, and the standby time can be more than 48 days