The Amazon Medical Fred First Defibrillator has a daily automatic system self-check alerting the user to any malfunction.

• 'Fred First' Lithium battery has 5 year operating life
• Capacity = 200 shocks or 8 hours of operation
• Step by step verbal and onscreen prompts
• High resolution LCD screen displays time, number of shocks and battery status
• Electrode connection indicator with automatic switch when child electrodes used
• Flashing LED indicates standby state
• Daily automatic system self-check, alerts user to any malfunction
• Dimensions: 23 (L) x 22 (W) x 7cm (H)
• Weight: 1.5kg (battery included)