Built-in telephone ring signaler with connection cord
LED: Flip-up LED reading lamp
Alerts: Flashing LED visual alert
Volume: Variable alarm volume (up to 98 decibels volume) and tone controls
Connection: Output jack for optional bed shaker (sold separately)
Battery: Battery backup for clock time (does not display when running on battery power) and LED lamp (9 Volt battery not included)
12 or 24 hour display.
Dimensions: 5-1/4 inches Width x 4-3/4 inches D x 7 inches Height (11-1/2 inches Height with light open).