Flexible silicone keyboard, plug USB to work directly. Light weight, ultra-thin and compact keyboard even can be rolled up to take. Fits easily in your briefcase, backpack, or notebook carrying bag. High quality silicone material, durable, comfortable, waterproof and flexible. Soft touch and with no noise while typing. Unique printing technology guarantees letters will not wear out. Anti-dirty, waterproof, even can use soap and water to clean. Simply wipe out any spilled liquid with a damp cloth and then continue working immediately.