supply of megaphones complete with batteries.megaphones complete with batteries.,material conforming to megaphones complete with batteries (minimum 10 watts) with mini mum technical specification (1) as per is:7136( or latest) (2) weight up to 2.5 kg (without battery & witho ut shoulder strap), (3) rated power output: 25 watt (4) feature/accessories provided with megaphone: volu me control, strap for hanging from shoulder, on/off switch (non-locking type), input socket with appropriat e marking and cable for use with external power supply and shall be suitably polarized, socket for auxiliary input, microphone dust cover and straping arrangement for hand free operation. (5) electro acoustic require ment and climatic tests, as per is standard of product. test certificates shall be provided along with each c onsignment. (6) test of complete products from govt. /nabl test labs and report to be provided at the tim e supply. (7) voce range in traffic junctions (high noise environment )- 400 meter. (8) voice range in quite areas - 1000 meters. [ warranty period: 30 months after the date of delivery ] ]