Various arrangements of communication devices are presented. A combined battery and processing unit may be present that includes a housing, a battery, one or more processors; a microphone, and a speaker. The battery and the one or more processors may be permanently installed within the housing. The communication device could include a wristband, having a wristband housing defining a slot that opens on a first side and a second side of the wristband, to removably install the combined battery and processing unit within the slot of the wristband while the wristband is being worn by a user.