The system consists of a poolside transmitter and several waterproof bone conduction earphone . The 7 channel radio transmitter, has a range of about 150 mts and supports up to 20 receivers per channel at the same time. The volumc of the waterproof bone conduction earphone can be dajusted, so it's more suitableful for children.

The waterproof bone conduction earphone easily fits under any kind of swim cap and is designed to stay in position even during start and turns. The sound is perceived by the athlete from the headset via a bone conduction technology, which enhances the spread of temporal bone vibrations to the cochlea. In this way, the ear canal remains free allowing simultaneous perception of other sounds. Listening is always perfect even in a noisy, crowded pool!

What makes this unit different? The magnetic charging method!! 
Without the charging hole, you don't have to worry about the water going inside the product. 

Feature

1.Bone conduction technology, which enhances the spread of temporal bone vibrations to the cochlea. 

2.The students can hear the coach clearly even in a noisy environment.

3.Waterproof grade: IPX10(we have IPX10 certificate)

4.Underwater Signal receiving depth for the headset receiver : 5 meters

5.Receiving distance between transmitter and headset: 150-200 meters

6.7 channels available, the swimming coach could adjust channels to match with different headset receiver, 

7.The headset fits into any kind of swim caps and the hook design makes it not easy to fall. Also, it can greatly free the ears and makes it ergonomically nice to wear.