Ready to Use with Built in Battery: Includes a practical coin cell battery with low power circuitry, offering immediate use upon unboxing Perfect as a keychain accessory, backpack charm, or car clock Ergonomic and Portable: Waterproof clock is perfect for on the go use, easily fitting in pockets or attaching to backpacks for timekeeping Quiet operations for Focused Environments: Ideal for studying, exams, or quiet spaces The large LCD display ensures quick and clear time reading at a glance Soft Night Light for Clear Visibility: Features a full screen green night light activated by a sensitive button, providing backlight for easy reading in dark environments practical Waterproof Designs: Craft from ABS with IPX7 waterproof rating, this kitchen and bathroom clock resists splashes, rain, and sweat, ensuring practical in daily use