Wirelessly offers from Amazon.com

Wireless technology uses radio frequency to both transmit and receive messages about a hazard in the home. Battery powered enables homeowners to install interconnected smoke alarms in existing homes without rewiring. Smart touch button quickly and temporarily silences nuisance alarms activated by any alarm in the system. Wireless alarm can be installed in a detached workshop or shed to work with your interconnected system.
Price: $42.99 [Notify me when price goes down.]

Sold Individually.
Price: $28.99 [Notify me when price goes down.]

Wirelesssly stream music and incoming calls. Integrated microphone for hands-free communication. Up to 11 hours play time 12 hours talk time and 205 hours standby. Features answer/end function and 3-way calling.
Price: $45.99 [Notify me when price goes down.]

2x Pocket Wizard Plus II Transceiver/Relay Radio Slave - Combined Transmitter and Receiver 801125.
Price: $369.00 [Notify me when price goes down.]

WIRELESSLY TRANSMIT MUSIC FROM IPOD(R) TO ANY FM STEREO, PUREFM TECHNOLOGY PROVIDES SUPERIOR TRANSMISSION, SAFELY POWERS & CHARGES WHILE TRANSMITTING, INCLUDES CONVENIENT PLAY/PAUSE/NEXT TRACK BUTTON, EASY-TO-READ LED DISPLAY & 2 USER PRESETS, CHARGES UP TO 2X FASTER THAN WITH A COMPUTER, COMPATIBLE WITH ANY STANDARD 12V ACCESSORY OUTLET, LIMITED LIFETIME WARRANTY.
Price: $49.99 [Notify me when price goes down.]