Control mode: high level on, low level off, can be dimmed through PWM. Application environment: Suitable for Arduino- control, MCU control/indicator light/light tube It can be used for Dupont wire connection of single chip microcomputer to control luminescence, without additional drive circuit Suitable for all kinds of 3.3V/5V sing le chip microcomputer;With on-board current limiting resistance; Led indicator light Red yellow blue green white electronic blocks Package Includes: 1 PC 20mm LED Light-emitting Sensor Module Specifications: Product Name: 20mm Luminous LED Module Supply Voltage: 3.3V-5V Operating Temperature: -40C- 85C Software Interface: digital TTL level Size: approx 20mmx 20mm/0.79x0.79in Color: Red, Yellow, Blue, Green, White Quantity: 1PC note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.