ADAPTER CABLE MV400-RING LIGHTS ALLOWS THE CONNECTION OF 6GF3400-0LT0-7BA1 AND 6GF3400-0LT0-8BA1 TO MV420 AND MV440 ONLY WITH POWER SUPPLY VIA 6GF3440-8BA2 OR 6GF3440-8BA4 CONNECTIONS M16,12POL SOCKET M16, 12POLE CONNECT M12, 4POLE SOCKET EFFECTIVE LENGTH 25CM