Honeywell's 5808W3 is a 3V lithium powered, photoelectronic smoke/heat detector with a built-in wireless transmitter. It is intended for use with any 5800 Series Wireless Receiver/Transceiver for residential installations (for commercial installations, the 5881ENHC or the 5883H receiver is required).
Utilizes one long-life 3V lithium battery
Microcontroller runs on a 4.0 MHz clock
Horn operates at 3.3 KHz with sound pressure level of 85 dBA at 10 feet