Shen Zhen Shi Jia Hui Di Technology Co., Ltd. is based in China and lists the Handheld Metal Detector on Global Trade Plaza. The product is identified as the MD-3003B1 model, a small handheld metal detector designed for security checking. It features audio and LED alarm indication, sensitivity calibrated to detect a RMB one yuan coin at 3cm, and operates on a 9V fold battery (6F22ND) with low battery indication and optional recharger compatibility.