The EZL 2020-20L charger case has been designed to be highly user-friendly. It acts as both the storage case for all equipment and charging station for the Tourguide receivers and transmitter. Twenty charging bays for HDE 2020-D or EK 2020-D receivers and two charging bays for the transmitter or its rechargeable battery pack-are provided. Truly impressive feature of the charging case is the Copy button. All you need do is to set one receiver to the correct channel, press this button just once, and all of the other receivers in the case will immediately be set to the same channel.