Two-way radios allow push-to-talk, real-time voice communication to collaborate, coordinate action, and share information or alerts. Batteries and chargers keep two-way radios powered up and ready for use. Audio accessories include devices that connect with two-way radios to transmit communications as well as components that adapt audio devices for specific uses. Antennas pick up and send out radio waves that two-way radios convert into voice communication. Carrying and mounting accessories hold two-way radios for hands-free use, transport, and protection from damage. Programming cables and software assist with applying radio frequencies and other operating parameters to two-way radios. Repeaters strengthen and retransmit radio signals to extend the range of two-way radios. Police scanners receive radio transmissions from frequencies used by law enforcement and emergency services.