Sunstech CEL2 Manual De Instrucciones página 40

Avoid charging the device for over a week, because overcharging can
reduce the battery's service life.
With time, the device will run out of battery (even when it is not being
used) and you will need to recharge it to use it again.
Disconnect the charger from the power sources when it is not being
used.
Use the battery only for the purpose for which it was designed.
If you do not use the battery for a long time, you may reduce its service
life and performance. You may also cause the malfunctioning or
explosion of the battery or a fire.
Follow all the instructions in this manual to guarantee the longest
service life possible for your device and battery. Any damage or
operating problems caused by not complying with the warnings and
instructions may cancel the manufacturer's warranty.
With time, the device may wear out. Some parts and repairs are covered
under the warranty during the validity period; however, the damages
or deterioration caused by the use of accessories not approved by the
brand are not covered.
Take the following information into account when using the device.
Use it in a vertical position, as you would a traditional telephone.
Speak directly into the microphone.
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