This security alarm comes with a strap and has a compact design for easy carrying. Purchased last autumn, the battery is the one that came with it, and as of February 2026 (R8), both the alarm and flashlight are working properly. Body length: approximately 8.5cm, width: approximately 4.8cm, thickness: approximately 2.6cm Weight: approximately 62g including strap and battery Pulling out the shorter strap activates the security alarm. The strap is long enough to be worn around the neck and is yellow. Thank you for looking.