For the optimal running of the products, it is important that the batteries be at their maximum charge during operation.
During start-up there is the designation of a code of transmission transmitter/receptor : for correct recognition of the station and it(s) transmitter(s): the appliance therefore needs maximum power.

The level of battery charge should not go below a certain level (too weak): in general, a weak battery icon appears on the LCD.

But please note that if this sign does not appear, this does not mean that the batteries are ok.

Check that the batteries +/- in the appliances are correct.

Do not use rechargeable batteries that aren’t 100% charged let alone those that don’t go above 1.3 V.

When charging batteries in one of the modules (antenna or transmitter), you must always take the batteries out of all the appliances (antenna and transmitter) and restart everything, paying attention to the order of battery insertion.

Certain appliances are delivered with chargers intended for mains supply connection: these AC/DC plugs have specifications unique to each type and necessary for any appliance.
Do not use chargers with different specifications: this may permanently damage the electronic circuits of the appliance.