The best replacement for transmitter is cassette adapter.

The best alternatives to transmitter are rated as following:
★★★★★  cassette adapter
★★★★★  transducer
★★★  cassette
★★★  modulator
★★  aux
★★  transponder
★★  harmonica bug
★★  fm modulator
★★  pressure transducer
★★  tape adapter
★★  cassette adaptor
★★  aux cable
★  auxiliary input
★  bluetooth
★  tape deck
  pressure switch
  sensor
  recevier
  cassette adapter ipod
  aux in
  receiver antenna
  rtd
  hoof
  pressure transmitter
  transceiver

Your alternative for transmitter is not listed? Suggest!
Speaking about transmitter, one probably shouldn't forget about bluetooth.

Other search terms related to transmitter and their ratings are:
★★★★★ bluetooth
★★★ remote
★★★ monitor
★ car kit
★ static
★ bluetooth®
diaphragm seal
car charger
You have in mind a companion for transmitter and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of transmitter in all years. Click on graph for more.
transmitter
cassette adapter
transducer