Security alarm with LED. Includes instructions. Only used to test functionality. Body weight: 66g (including batteries) Volume: 92dB (measured at a distance of 1m) Batteries: 2 x AAA batteries (Maxell manganese batteries) Continuous sounding time: 150 minutes at room temperature 23.7°C LED continuous lighting: approximately 20 hours Material: ABS resin Size: 35mmφ x 90mm