About Marsyu

01 · FIRST USE

Connect your ET571.

Companion app: G Band. This is the name in the supplied guide. Use the app linked in the instructions supplied with your device. Check its current App Store or Google Play requirements before installing. If the app or menu differs, contact us before switching apps.

Before first use, charge the watch using its supplied magnetic cable. Press and hold the upper side button to turn it on.
The supplied guide names G Band. Enable phone Bluetooth, open Devices in the app and choose Connect. Select the watch’s Bluetooth name and accept pairing.
The guide describes separate data and call connections. If your device presents a Bluetooth audio request, pair it and follow its Call Settings. If your device or packaging differs from the guide, contact support with a photo of the device and its model label.

Charging & everyday care

Align the supplied magnetic charger with the contacts on the back of the watch, then connect its USB end to a 5V USB power source.
Do not charge in the presence of water or use a damaged cable.
Keep the skin-contact area clean. Remove the watch if irritation occurs. Do not open the case.

02 · EVERYDAY FUNCTIONS

Make sense of your records.

Once connected, use the app to review the activity, heart-rate and sleep records supported by your device. Sleep records require wearing the device during sleep. Available settings depend on your device and app version.

Health readings are for general wellness reference, not medical diagnosis, treatment or prevention. Do not change medication based on these readings.

If you need help with another feature, contact us with a photo of your device and the feature screen so we can match the instructions to your version.

See real app examples

Original English app screens from a demonstration session. The readings belong to that session; these images do not confirm every menu or measurement for your device.

Activity records: actual English app demonstration — Activity records

Heart-rate records: actual English app demonstration — Heart-rate records

Sleep records: actual English app demonstration — Sleep records

03 · TROUBLESHOOTING

Try these checks first.

The app cannot find my device

Make sure Bluetooth is enabled, the device is powered on and charged, and your phone is nearby. Check that the device is not already connected to another phone. Reopen the app and try its device-connection screen again. If it still cannot connect, contact support with your model and app version.

Records or time are not syncing

Open the companion app and check the device connection. Keep the app allowed to run in the background as needed, then reconnect. Do not assume that a record visible in a demonstration is supported by your particular model.

Notifications are missing

Check the phone’s Bluetooth connection and the app’s notification permissions. Enable only the notifications you want. Phone settings and background restrictions can affect delivery.

The device does not charge or switch on

Check the supplied cable, USB power source and contact alignment. Make sure the contacts are clean and dry. If charging still does not start, stop using a damaged cable or device and contact support.

A reading looks unexpected

Check fit and sensor contact, keep still during a manual recording and review the instructions for your model. Readings are for general wellness reference. Do not use them for diagnosis, treatment or medication decisions; seek medical advice about health concerns.

04 · YOUR MANUAL

The right guide for your device.

Need a copy of your manual? Tell support your model and preferred language so we can send the matching guide.

Request your manual

05 · HERE TO HELP

Still need a hand?

Contact MARSYU with your model name, a short description of the issue and your order reference if relevant. A photo of the device and its model label can help. Please do not send passwords, full payment details or unneeded health readings.

Contact MARSYU

rhoddudley4@gmail.com