supply of shunt safe device(unit) working with 12 volt rechargeable lithium ion battery with alarm, battery indication & water proof cover of box with battery overcharging auto cut & battery charging led indicator. 1. the unit should be an audio visible alarm unit to be used by the shunting staff for their own safety during shunting operations.2. the unit should be made of at least 1.2 mm thick ms sheet duly powder epoxy coasted.3. the visible indication is to be provided with the help of a matrix of blue led?s of 5 mm diameter.shunt safe device(unit) working with 12 volt rechargeable lithium ion battery with alarm, battery indication & water proof cover of box with battery overcharging auto cut & battery charging led indicator. 1. the unit should be an audio visible alarm unit to be used by the shunting staff for their own safety during shunting operations.2. the unit should be made of at least 1.2 mm thick ms sheet duly powder epoxy coasted.3. the visible indication is to be provided with the help of a matrix of blue led?s of 5 mm diameter.,shunt safe device(unit) working with 12 volt rechargeable lithium ion battery with alarm, battery indication & water proof cover of box with battery overcharging auto cut & battery charging led indicator. 1. the unit should be an audio visible alarm unit to be used by the shunting staff for their own saf ety during shunting operations.2. the unit should be made of at least 1.2 mm thick ms sheet duly powder e poxy coasted.3. the visible indication is to be provided with the help of a matrix of blue led?s of 5 mm dia meter. the front size matrix should be having 4 rows and 4 columns and the matrices on either side should have 1 column of 4 led?s each. the leds should be flashing with one second off and one second on times. the side led?s should be located at an angle of 32 to 35 degrees from the front matrix, with the objective i s to disperse the light in the front, as well as on the two sides.4. the audio alarm should comprise