Sanwa PGS-CLE Type E servo
From Sanwa, their new PGS-CLE servo is developed for use with low power supply BEC from the ESC. The BEC (Battery Eliminator Circuit) in some budget class ESC models sometimes cannot supply enough power for the servo. The PGS-CLE can work stably, even if it cannot receive enough power from the ESC. The servo is waterproof, SXR and SSL compatible, has metal gears, sports an aluminium heat sink as utilises a coreless motor.
Source: Schumacher [racing-cars.com]