Item Type: Portable Diamond Selector Tool Material: Plastic Battery Type: Lithium Battery(Include) Battery Model: AAA Battery Battery Capacity: 900mAh Battery Quantity: 2pcs Package List 1 x Diamond Tester Tool 2 x Batteries 1 x PU Leather Case 1 x User Manual 1 x Iron Piece 1Efficient Testing: Portable diamond selector tool can quickly and accurately test the stability and hardness of watch sapphire, which is practical and reliable. 2Light Sound Remind: When a real sapphire is detected it is indicated by a red LED indicator and sound reminder, suitable for testing various stones. 3Alarm Function: Portable diamond tester tool with metal alarm function, it will keep buzzing when accidentally touching metal, bring you convenient use. 4Clear Readings: Portable diamond tester tool provides easy to read test results, ensuring accurate assessment and reliable performance for you. 5Convenient and Portable: Diamond selector tool is made of lightweight plastic material, comes with 2 lithium batteries for easy testing when travelling.