Above the water, the blue lights, your iPhone plays fish feeding sounds to transducer below the water, the pink flashing light. One supplier is talkwithfish.com. with a 4 ohm, 10 watt speaker.
Also, with 4 ohm, 10 watt amplifier you can play music underwater in your swimming pool.
If using with amplifier as listening device you may want second earphone jack. Listen to one and sound record on second jack.
