Retekess TT111 Manual Del Usuario página 8

The indicator light will be flashing as soon as the receiver is
turned on, the battery level is full if the indicator light
flashes 5 times, the battery level has only 80% left if the
indicator light flashes 4 times, and the battery level has only
20% left if the indicator light flashes only once.
Attention:
When the transmitters and receivers are not used for a long
time, please charge them once every 3 months, so that the
batteries can be protected. (There is lithium battery inside
the device, if it was not used or charged for a long time, the
battery would be damaged.) In one word, make sure that
the batteries inside the transmitters and receivers always
have power.
User manual of Charging case
1.Power supply：AC 90V--250V
2.When it is going to be charged, take the foam out, and
keep the cover open in case it gets hot .
3.When it is charging, the battery level on the display
screen of the transmitters shows going up, and it stops
when the battery level is full. The indicator light of the
receiver is red when it is being charged, and the indicator
light will turn to be blue when the battery level is full.
4.Normally it takes about 2 hours to charge the receivers
full, and takes about 5 hours to charge the transmitters full.
Specification
Transmitter
Frequency
Range
ID Number
Supply
Voltage
US:902-928mhz
EU:863-865mhz
US:100 EU:36
DC 3.7V
Receiver
Frequency
Range
ID Number
Supply
Voltage
06
US:902-928mhz
EU:863-865mhz
US:100 EU:36
DC 3.7V