This paper presents the design and implementation of an electronic car sticker (e-sticker) using a proprietary RFID protocol. The system is a wireless data transmission system and consists of a monitoring module (reader) and many data acquisition modules (tags). In order to extend the battery life, the hardware and software components in both reader and tag modules are specifically designed to consume minimal power/energy. The proposed e-sticker can replace many windshield stickers such as registration, inspection and parking stickers on vehicles and can be monitored by patrol officers, inspection stations and authorized offices.