Important informations for you:
First, pls keep a distance of less than 10 meters between the headset and another bluetooth device(like mobile phone), because according to the current technology, Bluetooth can not work well outside the distance of 10 meters.It's not the problem of the headset, it's only the problem of the limitation of Bluetooth Technology.
Second, you must take another bluetooth device(like mobile phone)into the water in the same time too when you are swimming, as the distance between the headset and the mobile phone must be less than 10 meters.You can put your mobile phone into a waterproof arm bag, you can buy this kind of arm bag everywhere on .
Third, if you don't want to take the mobile phone into the water when you are swimming, you can choose another headset in our store - B07BP8Q73H , it has the functions of bluetooth + MP3 player, that's to say there's an internal memory in the headset, you can download the music of MP3 format into the headset and then you can listen to the music with only the headset. You don't have to carry 2 Bluetooth devices into the water in the same time.Thanks!
Bluetooth Version: 4.1;
Bluetooth Chip: CSR8645;
Bluetooth Operation:class 2 ;
Transmission Distance: ≥10m;
Working Frequency: 2.401GHZ-2.482GHZ;
Speaker Type :Φ8mm 16Ω;
Battery Capacity :2*50mAh, 3.7V;
Charging Input Voltage Range :DC 4.8-5.5V;
Talking time:About 6 hours;
Playing time:About 6 hours ;
Standby time:About 160 hours ;
Battery:High-capability rechargeable lithium polymer battery ;
1 x bluetooth headset;
1 x Earbud;
1 x USB Cable;
1x user manual.
EMEBAY - Sports Bluetooth Headphone IPX7 Waterproof Diving Wireless Headset Armor Auriculares Bluetooth 4.1 Headset Wireless Earbuds For Running Swimming Dacom P10 (Blue) - B07BBQR5CP