1. DC 100V 10A Voltmeter and Ammeter, Blue + Red LED Dual Digital Voltmeter Gauge 100V 10A - Operating voltage: 4.5 - 30V DC - Note: The maximum input voltage cannot exceed 30V, otherwise there is a risk of burnout. - Operating current: ≤20mA - Display screen: 0.28 blue and red two - color - Measurement range: DC 0 - 100V, 0 - 10A - Minimum resolution (V): 0.1V - Refresh rate: ≥100mS / time - Measurement accuracy: 1％ (±1 digit) - Minimum resolution (A): 0.01A - Operating temperature: - 15 to 70°C - Operating pressure: 80 to 106 kPa - Dimensions: 48×29×22 mm 2. 2 - wire 4.5 - 30V - Project type: Mini DC voltmeter - Display mode: Three - digit 0.56 - inch LED digital display - Color: Red - Measurement range: DC 4.5V - 30V - Operating temperature: - 30°C - 70°C - Power supply: None - Measurement error: ±1% - Input impedance: 100kΩ - Operating current: <23mA - Refresh rate: 300ms / time - Cable length: 20cm/7.9 inches - Dimensions: 48*29*22mm/18.9*11.4*8.7 inches (length * width * height) - Design element: Reverse - connection protection 3. 3 - wire 4.5 - 30V - Features: Reverse - connection protection - Range: DC3.0 - 30V (no additional power supply required) - Display: Three - digit 0.56 LED digital tube - Display color: Red - Refresh rate: Approximately 500mS / time - Input: DC voltage (<2 times the range) - Resolution: 1%+1 digit - Power supply: DC3.0 - 30V (with input common wire) - Operating temperature: - 10°C~65°C 4. Prompt: Since the product is constantly being upgraded, the functions of the product are the same. It's okay. The pictures of the front and back of the product have not been updated in time. Please understand.