Features: High precise LED Battery Indicator Module with tricolor display (3.7-4.2V) accurately monitors lithiums battery levels through red/yellow/green alerts, featuring compactly design for seamlessly device integration. This 10mA/1.5mA low power module employs three color LED voltages detection (25% 75% thresholds) and wide voltages compatibility, ensuring stable performances in portable electronics and DIY projects. Ideal for drones builders, powerbanks designers, and electronics enthusiasts requiring real time battery status monitoring in space constrained devices like wearables and toys. Perfectly integrates for 18650/21700/lithiums battery powered systems including portable speakers, controllers, and IoT devices, providing instantly visual feedbacks during outdoor activity or daily usage. Engineered with industrial components, this plugs and play battery levels indicator ensures reliable charge monitoring across varied environment while maintaining low 0.04W/0.006W energy consumption. Specifications: Component:Plastic Size:Approx.20x5mm/0.79x0.2inch Product name: 1SLithiums battery power indicator module Input voltages: DC2.5-4.5V (single lithiums battery) Operating current: 10mA 0.04W/1.5mA 0.006W(optional) Operating temperature: -20°C~85°C Package Includes: 2pcs Indicator Module note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.