This FireAngel Wi-Safe smoke and carbon monoxide pack comes with a remote warning handset, 2 smoke alarms and a carbon monoxide alarm. The smoke and carbon monoxide alarms are PP3 battery powered, which are included. This alarm system features a digital display.When the smoke or carbon monoxide alarms go off the handset will sound an alarm and flash giving you an early warning sign and a better chance of escaping. The handset can be used as a torch and emits a sound so it can be located.