Epsilon Electronic Equipment & Components Pvt. Ltd. Manufactures Desk Type Electronic Magnetic Telephone. Epsilon Electronic Equipment & Components Pvt. Ltd. Supplies signal & telecom items for the Indian railways. Desk Type Electronic Magnetic Telephone has a push button switch on the top of the telephone body and by pressing this, a DTMF tone is sent to the omnibus line. Desk Type Electronic Magnetic Telephone is used for point to point communication between ASMs of a yard cabin to LC gates. This telephone works on 3VDC by using 2 hrs. Of dry battery as per IS : 9128 type R-20.