... :>85DB at 1M 5.low battery signal Co alarm GS804 with EN50291Power ... Supply: DC 9V battery operatedSensitivity Setting: conforms to EN50291Standby Current ... Alkaline 6Lr61, 1604A for ANSI,6AM6 for JISBattery Size: 25.5 * 16.5 * 47.5 (unit: mm), it is approximation.Recommended battery ... : Gold peak 1604A,Gold power G6F22Alarm sound : ≥85DB at 100cm @ 3.4±0.5KHz pulsing alarmPacking Size ...