The SOOCOO G1 Action Cam is a Waterproof WiFi camera that doesn't require a case in order to be submerged.
waterproof
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The Zeblaze COSMO Smart Watch is a sylish kind of smart watch that is running Android OS and water resistant.
The Xiaomi Mi Band 1S has a Heart Rate Monitor, Bluetooth, Sleep Monitoring and best of all is IP67 which you can submerge under water.