Atwood's LP gas detectors are ETL listed and tested to UL 1484 for residential and RV use. Available in 12-Volt DC or 120-Volt AC power configurations. Choice of black or white housing and bezel colors. Mounting kits available for surface and flush mount applications. Optional adapter mount ring allows detector to fit the 3-7/8" x 3-1'8" cutout from the last generation of flush mount Atwood LP detectors. Dimensions: Surface Mount 3-3/8" L x 2-1/4" W x 1-1/53/8" L x 2-1/2" W x 7/8" D.