... ,LEDS keep on ,when people leave such range ,LEDS will be switched off after 30 seconds.When switch be in ... 5-8m of induction head,which explore body's temperature,output the controlling signals by handle of ... .use specified battery 2.take note of battery's polarity,avoid damaging to the battery for fixing ... 2.Please take note of temperature and humidity's change,or else that will influence lifespan of ...