Ideal For Patients Who Needs The Reminder Of A Lap Belt But Who Is Able To Self-Release. At The Instant That The Belt Is Separated An Alarm Sounds To Alert Staff And Remind The Patient To Remain Seated. The Durable Nylon Belt Features A Bright Red Pull Strap To Facilitate Locating And Releasing. The Detachable Alarm Box Features A Tamper Resistant Switch, Low Battery Warning, LED Indicator, Full Perimeter Silicone Jacket, Hook And Loop Mounting Strap With Upholstery Clip. 9 Volt Battery Included.