[DETAIL] Note： The input voltage must not exceed 100V, too high a voltage will cause irreparable damage to the product.  Main Specifications:  Measuring range: 4-100V  Power supply range: 4-100V  Minimum start-up: 3.8V  Allowable error: ±1%  Input impedance: >100K ohms  Operating current: red <100mA, green <12mA, blue <12mA  Refresh speed: approx. 300mS/time  Display method: 3-digit round LED tube  Display colour: red, green, blue optional  Lead wire length: 20cm  Overall dimensions: 33.8 diameter  Opening size: diameter 30.3  Operating temperature: -10℃~65℃  Package: 2pcs DC 4-100V LED Digital Display Circular Two-wire Voltmeter DC Digital Voltmeter [ATTRIBUTES] - Hign-concerned Chemical: None - Type: Voltage Regulator - Origin: Mainland China - Hign-concerned Chemical: None - Type: Voltage Regulator - Origin: Mainland China - Condition: New