These are my two antique remotes. The Zenith was for a b/w tv from around 1963-1966, and the RCA for a color TV around 1968. Both work. The RCA remote takes a AA battery and transmits ultrasonic tones, somewhere around 28kHz if I remember correctly. The Zenith "clicker" does not require a battery but works by the tuning fork method, where one of the four tuning forks is struck when a button is depressed and an ultrasonic tone is generated. We had that remote growing up and my dad would get pretty peeved when you would walk into the room and your keys or loose change would cause the channel to change or mute while he was watching TV.... Hope these bring back some memories....