iLevil trim tab technology replaces heavy servos with a lightweight easy to install solution. Control pitch and roll from a mobile phone or tablet when connected to the iLevil AP autopilot module (sold separately).Version (EDMO# 3900152C) designed for low speed aircraft includes two trim tabs with waterproof lightweight servos, cable and wire, harness, and pre-attached adhesive tape.*Trim tabs require and are only compatible with the iLevil AP autopilot module (not included).