(1) Special design for DSC-N4/DSC-Cute.
(2) DSC-K1 signal key type, can control 16 programs.
(3) DSC-K2 double key type, can control 60 programs.
(4) No need extra power (from DSC-Cute/N4).
(5) IR keypad available.
(6) Operation wilt other device (Trig-8, TCD-01).