ITEM NAME:3pcs 0.28 inch 2-wire 3.5-30V DC LED Display Digital Voltage Meter Description: - 2-wire 3.5-30V DC voltmeter. - Lightweight and highlight 0.28 inch LED nixie tube displays. - Reverse connection protection technology for avoiding short circuit. - Adapt 2-wire lead: red wire for positive pole and black wire for negetive pole. - High precision, low voltage activation and stable operation. - Decimal point automatic adjustment. Specification: - Display Color: Red/Blue/Green - Display Mode: Three-digit numbers - Testable Voltage Range: 3.5-30 V - Working Temperature: -10℃~65℃ - Consumption Current: less than 20mA - Renewed Speed: 500ms/time - Size: 3.2x1.3x7 cm/1.25x0.51x2.75 inch - Wire Length: 15 cm/5.9 inch Package Included: 1 Piece Red LED Digital Voltmeter 1 Piece Blue LED Digital Voltmeter 1 Piece Green LED Digital Voltmeter.Adapt 2-wire lead: red wire for positive pole and black wire for negetive pole. - Display Color: Red/Blue/Green. - Display Mode: Three-digit numbers. - Consumption Current: less than 20mA.