+ 20-100 channels 
+ Durable and lightweight
+ Easy to operate
+ Full day usage with no charging
+ Portable charger cases

Q:Do I need to order the batteries separately?

A:No. Each
transmitter and receiver is supplied with a battery.

Q:Can two transmitters operate on the same channel?

A:No. Each
transmitter must be on an individual channel. If more than one presenter is
required to take part during a tour then the transmitter can be passed between
them. The presenters can either speak in to the integrated microphone on the
transmitter, or use a (recommended) Plug-in microphone. This is ideal for
interviews during a tour or any question/answer sessions.