Product specifications: - Model: JS-C33 - Product size: 6.2 x 3.4 x 1.4cm / 2.4 x 1.3 x 0.6 inch - Installation size: 5.9 x 2.9 cm / 2.3 x 1.1 inch - Screen size: 3.6 x 2.0cm / 1.4 x 0.8inch - Working voltage: 10V-100V - Working current: 5mA - Sleeping power: 10μA - Working temperature: -10°C to 55°C - Backlight color: Blue - Weight: 21g per unit - Package includes: 2 x Capacity Monitor Features: 1. Low power warning indicated by flashing red light. Simple installation with buckle design, no screws required. 2. Uses liquid crystal display for clear and bright readings, visible in low-light conditions. 3. Displays battery voltage, temperature, and capacity percentage on a single screen. Note: Default settings are optimized for 12V lead-acid batteries.