supply of shunt safe device/ shunt safe unit-shunt safe device/ shunt safe unit-,shunt safe device/ shunt safe unit- shunt safe unit / device:-shunt safe u nit working with 12 volt rechargeable lithium ion battery with alarm , battery indication & water proof cover of box witshunt safe unit / device:-shunt safe unit working with 12 volt rechargeable lithium ion battery with alarm, battery indication & water proof cover of bo x with battery overcharging auto cut & battery charging led indicator 1. the unit should be a n audio visible alarm unit, to be used by the shunting stall for staff and passenger?s safety during shunting operations. 2. the unit should be made of at least 1.2 mm thick ms sheet duly powder epoxy coasted. 3. th e visible indication is to be provided with the help of matrix of blue leds of 5 mm diameter. the front size matrix should be having 4 rows and 4 columns and the matrices on either side should have 1 column of 4 l ed each. the led should be flashing with one second on and one second off. the side led should be locate d at an angle of 32 to 35 degrees from the front matrix, with the objective is to disperse the light in the fron t as well as sides. 4. the audio alarm should comprise of a loud speaker of such intensity as to be audible fr om a distance of at least 75 meters in a noisy environment. nominal audio power output of the unit should be l0 watt, which should be provided by the means of the sturdy horn type loud speaker. the horn should b e protected with the help of ms bracket of suitable size duly powder coated. sound to be intermittent to be decided in consultation with railways. 5. the unit should be provided with a battery backup of at least 6 to 7 hours. rocker switch; on/off switches is to be provided to control the device 6. battery 12v /4.5ah lithi um-ion battery. smps based charger to be supplied along with device to charge the battery. 7. the unit sha ll be usable in all weather conditions in open areas. the design should be