7 channel transmitter, microphone and charger included.
Up to seven coaches can instruct their groups at same time in the same swimming pool. Coach are able to talk to swimmers with headsets down to 1 meter under surface. If sea water (salt water) only transmission near surface.
Several swimmers headsets without limitation can be used to each transmitter.
1 year warranty.
You can find more information about Olander Aquatalk in enclosed pdf below.