Wireless automobile audio system

A battery-powered speaker unit comprising:

• one or more batteries to provide power during operation;
• wireless communication circuitry configured to receive audio signals from a transmitter unit, wherein the transmitter unit is configured to be installed in a vehicle and electronically coupled with a head unit in the vehicle, wherein the transmitter unit is configured to receive audio signals from the head unit of a vehicle;
• one or more amplifiers to amplify the audio signals;
• and
• one or more speakers configured to produce sound based on the audio signals.

A wireless audio system comprising:

• a transmitter unit configured to be installed in a vehicle and electronically coupled with a head unit in the vehicle, wherein the transmitter unit is configured to receive audio signals from a head unit of a vehicle, wherein the transmitter unit is configured to be powered by the vehicle, wherein the transmitter unit includes wireless communication circuitry configured to wirelessly transmit the audio signals;
• and
• one or more battery-powered speaker units, each powered by one or more batteries during operation, wherein at least one of the one or more battery-powered speaker units comprises:
• additional wireless communication circuitry configured to receive the audio signals from the transmitter unit;
• one or more amplifiers to amplify the audio signals;
• and
• one or more speakers configured to produce sound based on the audio signals.