Junghans J615.74 Manual De Instrucciones página 6

2. Environmentally friendly solar technology
3. Automatic time synchronisation
For the USA's WWVB time signal transmitter the following specific
feature applies:
Recommendation: To ensure the best possible conditions for auto-
matic reception of the time synchronisation signal, the watch should
not be worn and, if possible, not left near to any electrical appliances,
mobile or cordless phones.