Electronic grip strength tester, specifically designed for high school entrance examination training: student exams/strength competitions/leisure and entertainment. Dual-purpose for charging and battery: It can be used with a 2xAAA battery or via USB. LED white light high-definition display: The large screen shows clearly, and even the elderly can see it clearly. High-precision sensors more accurate measurement. The pulling force can reach 120kg: It can withstand a grip force of 120kg, meeting the needs of different groups of people Power Supply:2 x AAA battery (Not included batteries) Color:Black Material:ABS Package Contents: 1 * 201 Electronic Grip Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.