Yes, all Dynapro active and portable bands have Bluetooth.
The battery needs to be charged, or if it has just been charged, you need a new battery.
The best cable for audio devices, regardless of the type of its coating, which is more commercial, is a cable that is sprayed and its material is pure copper.
No. More than 90% of commercial speakers have a paper screen that cannot be waterproof, but all passive Dynapro bands are resistant to water and moisture, but not waterproof.
Regular and complete charging is the first recommendation, if you do not use the device for a long time, recharge it every three months to maintain the health of the battery.
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