TEC801 GSM PHONE REMOTE CONTROL SYSTEM Our tec801 single relay GSM remote door control device can be easily used in cases where a single door opening is required. It can be easily used in products such as arm barriers, sliding door motors, automatic shutters and garage doors. It has a 3060 memory replaceable memory module. It is very easy to manage. Feedback is given via SMS. It is a cheap, durable and practical domestic production device. A sim card must be inserted into it.