Battery Life at Alarming mode: 45 minutes Battery Life at stand-by mode: 10~12 month Battery Life at LED mode: 3.5 Hours LED light for emergency use up to 30 Lux. Up to 100 dB alarm sounds within 3.28 ft. (1 m) distance. Travel Alarm can easily setup by just hanging on the door knob and insert the door clip sensor into the door gap. RXP-100 helps to guard your door or window from possible intruders with 100 dB high pitch alarm. LED light for Emergency Use 2pcs/pack.