The Angel Eyes E1 is powered by the RovyVon hybrid battery system. the built-in Lipo battery is for daily use and high performance and the replaceable AAA battery is for long runtime like camping. hiking. etc.. or where there's no access to charge the Lipo battery. The E1 body is made of polyamide that is lightweight and durable. it weighs 39g. 

The E1 has some changes compared to the first Angel Eyes model - E3. other than the material. It has a dual button. one has the same function as the E3 and another button is dedicated for quick access to Strobe and Momentary on. And the charging indicator method is different as well. breathing blue is in charge and the charge complete is solid green.