4-noks is a brand of Astrel Group a company specialising in the design and production of electronic solutions for the energy and wellbeing markets in the era of the Internet of Things. All 4-noks products are manufactured in the production plant of the Astrel Group’s parent company, with headquarters in Gorizia, Italy.

Astrel Group’s Quality Management System has been certified to ISO 9001 since 1999 and its Environment Management System is certified to ISO 14001 for the design, screen printing, wave soldering, assembly, final testing, sale and assistance of electronic monitoring and control devices.

Elios4you - Model E4U - Monitoring and Self-Consumption Device Instruction Manual