feature1.HOLD data retention2.MAX maximum / MIN minimum3.UN VOL, UNIT switch unit in PPM, (MG / M ^ 3)4. Alarm settings5. Calibration6. On/Off (timed shutdown)Package Included1 x hydrogen sulfide detector (without battery)1 x manualSpecification: General Certificate CE Package Weight One Package Weight 0.69kgs / 1.53lb One Package Size 27.3cm * 19.6cm * 6.6cm / 10.75inch * 7.72inch * 2.6inch Qty per Carton 30 Carton Weight 15.00kgs / 33.07lb Carton Size 77cm * 55cm * 18cm / 30.31inch * 21.65inch * 7.09inch Loading Container 20GP: 349 cartons * 30 pcs = 10470 pcs 40HQ: 812 cartons * 30 pcs = 24360 pcs