"SUPPLY, INSTALLATION, TESTING, COMMISSIONING AND HANDING OVER OF 21 Nos. WALKIE-TALKIES (INTRINSICALLY SAFE) DIGITAL RADIO TRUNKING SETS WITH DIGITAL DISPLAY SCREEN (FULL KEY PAD ALPHA NUMERIC) AND 11 Nos. 800 Mhz. UHF SETS DIGITAL RADIO TRUNKING BASE STATION WITH DIGITAL DISPLAY SCREEN (FULL KEY PAD ALPHA NUMERIC) COMPLETE SPARES WITH ALL ACCESSORIES ALONG WITH COMPREHENSIVE ANNUAL MAINTENANCE CONTRACT FOR A PERIOD OF SIX YEARS AFTER THE GUARANTEE PERIOD” for Chennai Port Authority