Powerful Vibration & Alarm Sound for Heavy Sleepers - The CoolFire Alarm Clock features a strong, silent vibration that fits under your pillow. Adjust the intensity and duration to suit your needs. Its powerful enough to wake heavy sleepers, including adults, teens, and those who struggle to wake up. With 3 alarm modes, its perfect for the hearing impaired or deaf. Easy to Use with Large LCD Display & 5 Buttons - The CoolFire Vibrating Alarm Clock for Heavy Sleepers has a clear LCD display for time, date, and alarms. The backlight activates with a button press, and the 5 buttons let you set time, alarms, vibration, and snooze. With 4 alarms and day-specific options, you can sleep in on weekends hassle-free. Rechargeable with USB & Long Battery Life - The CoolFire Alarm Clock for Heavy Sleepers comes with a USB cable for easy charging via laptop, power bank, or wall adapter. A low battery indicator lets you know when to recharge, and the battery lasts for weeks depending on use.