PAC HFKTY1 Bluetooth Hands-Free Integration Kit for Select Toyota Vehicles Plug-and-play into the oem radio harness, keeping the factory wiring in tact Provides audio switching for up to 4 channels Phone kit audio plays through the vehicle front speakers Handsfree Integration Kit for Select Toyota Vehicles Plug-and-play into the OEM Radio harness Provides audio switching for up to 4-channels Audio plays through the vehicle's front speakers Can also be hardwired to any aftermarket Bluetooth equipped with a mute trigger and a high level audio output