Check your eligibility criteria for tender Supply of Annuniciator Multiway Telephone Exchange 10 Lines With Wooden Box: Specification A General I No Of Extension 5/10 Ii Minimum No Of Extension In Conference- 3 Iii Power Supply Requirement 12V Dc, 1A B Speech - Send Output @ 5Mv More Than 774 Mv, Side Tone Suppression @5Mv Less Than 100Mv, Receive Output @ 193 Mv More Than 100 Mv C Calling System - Output Voltage In Open Condition More Than 80V Ac, Output Voltage Under Load Condition More Than 28V Ac, Frequency @ 25 Hz. Or With Better Specification, Suitable For Hand Generator Type Magneto Telephone As Per Rdso Specification No Irs:Tc-36/97.