Generic Brand New General Purpose Smoke Alarm 9 V Battery with Independent Smoke
Price 16.39 USD
Wireless way: alarm emission frequency F: 315 m / 433 m, * Round size; R = 105 mm, H = 38 mm * - 10 ℃ to 50 ℃ * 10 feet for 85 decibels * Electrostatic current less than 10 ua alarm working current 10 to 30 ma