Super device. From the luminosity they can compete well with the Hänsch Sputnik NanoMobil !! 150 saved. The only drawback: the connector maintains under train (this is the spiral cable probably) not and there can be only with a lot of feeling, a contact can be made. 4.99 invested in a better Plug and lo and behold, everything was great !!! Strong buy recommendation with this little restriction.