First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack Category_Amp Accessories True Wireless Stereo (TWS) allows

True Wireless Stereo (TWS) allows you to connect 2 GLS-880 speakers via Bluetooth with TWS Technology so they can play at the same time and you can double your audio output

Channel Configuration 5/4/3/2 Channel

Complete with Stainless Steel Mounting Hardware

Sensitivity  99 dB

The light can also operate standing upright for hands-free use

First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack Category_Amp Accessories True Wireless Stereo (TWS) allowsModel number SCO403; Bundles together a smoke alarm & carbon monoxide detector; Ionization smoke sensor reliably detects smoke from fast flaming fires; Electrochemical sensor accurately detects carbon monoxide; Battery operated alarms install easily without the aid of an electrician; Loud 85dB alarms; SA303 has 10 year limited warranty & CO400 has 5 year limited warranty; Includes 2 9V batteries & mounting bracket;