Specification 1. Press on/off button in í¦oní¦ position . 2. Test that is is working properly by tilting it forward, if it vibrates/sounds then it is a working state. 3. Place behind your right ear and adjust, it should be placed correctly for effectiveness.Your head should not nod more than 15-20 degrees (the less the better) , before it vibrates/sounds. 4. When the dvice is no longer required keep in OFF position . 5. For the protection of the device place back in its pouch and store with care out of direct sunlight and humidity, keep out of reach of children . Use in area : 1 : Stop, revive, Survive! Nap alarm gives instant warning if you nod off to sleep while driving. 2. Ever fallen asleep in a lecture? Nap alarm will gently and silently wae you up . 3.Excessive tiredness causes avoidable workplace injuries. Nap alarm will alert you if your head tilts forward in sleep . Batteriesú¦ 3*1.5V button batteries Colorsú¦Black Type: Vibration , sound Angle of the protectionú¦15íp~20íp Product sizeú¦76*53*15mm Certificate : CE FCC ROHS. Carton size : 65.1x43.48.6 cm Boxes/ctn : 4 boxes/ctn Quantity /box : 250 pieces Qty /ctn : 1000 pieces N.w /G.w : 18.5 kg /22.8 kg.