Features: Easy to learn analog circuits: With LM358 operational amplifier as the cored part, without programming is required, and analog circuits are used to achieve breathing effects, suitable for beginners to learn basic electronic principles. Heart shaped appearance+practical layout: LEDs form a heart shaped pattern, with clear component layout. The front emit light and the back is soldered, balancing aesthetics and ease of operate. Low welding difficulty, suitable for beginners: without precised components, complete accessories, low voltages (4-6V) power supply, welding is not easy to damage, friendly for beginners to practice. Adjustable breathing rate gameplay activity: equipped with potentiometer, adjustable breathing speed, supports component replacement to explore different effects, and expands learning space. Lightweight and cost-effective: compact in size, lightweight (approximately 130g), powered by USB/battery, suitable for or e-learning bulk purchases. Specifications: Component: PCB Light Color: red/blue/green/white Weight: 130g Size: approx. 5x5x1cm/1.96x1.96x0.39inch Working voltages: DC4-6V Package Includes: 1Pc Heart Shape Electronic Light Board note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.