The X-Sense SD06 is a battery-operated smoke detector with a photoelectric sensor that detects smoke and fire. It has an LED light that flashes when the alarm is triggered and emits a loud 90 dB sound. The smoke alarm has a diameter of 3 inches, a depth of 2 inches, and weighs 0.5 lb. It comes in white and requires one battery, which is not included. The unit has a manufacturer warranty of 10 years and is made in China.