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This research is intended to describe: 1. validity, practically and effectivity of devices which is developed by using RME; 2. Enhancement of students mathematical communication which used teaching and learning devices developed. It used 4-D model which consists of four stages: defining, designing, development and disseminate. The subject is grade XI of Senior High School 1 Barumun Tengah. The result of test I and II showed that (1) Teaching and learning devices developed is valid both in terms of content and construct; (2) Teaching and learning Devices developed was easily used seen by students dan teachers response; (3) Teaching and learning Devices developed is effective, seen by students mathematical communication; (4) an increase of students mathematical communication is 5,25