Features: This is a 0.49 inches OLED display module of 128x32resolution in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. Working without backlight, the OLED display module could give out light by itself. In low ambient light conditions such as a dark room, an OLED screen can achieve a higher contrast ratio than an LCD. OLED display module also has a much faster response time than an LCD. The display with small dimension is suitable for MP3, function cellphone, smart health device, etc. Specifications: Display Size: 0.49in Resolution: 128*32 Text Color: White, Blue (Optional ) Interface Type: IIC Pin Quantity: 4Pin Pixel Size: 0.045*0.194mm Operating Temperature: -40~85 ℃ Working Voltage: 3.3~5V Interface: GND: Ground VCC: Power supply+ 3.3~5V SCL: IIC clock SDA: IIC data Package Includes: 1 x OLED Display Module Note: 1, This kit requires certain professional knowledge and ability, please make sure you know how to wire and use it. 2, OLED display module could give out light by itself and it has no backlight, so it will not response if only connecting to power supply. It can only display with program and right operation. .