Equipped with productive field telephone set factory and company, Fenghuo Hongsheng is one of the leading China field telephone set manufacturers and suppliers. Welcome to contact us.Model HFDX-2 Field Telephone Set is a kind of wire communication audio terminal used in the field or indoor conditions. It is can be used not only as the magnet telephone but also as the normal telephone that is connected into the wire common telephone network.. Main Functions and Characteristics:1 The telephone set has been designed by adopting the sealed structure and has the characteristics of the good defending performance, the compact structure, the firm and durable usage, the anti-decline and anti-shock as well as the good water-proof so that it can adapt the wild abominable environment conditions.2 The product has adopted the new mini-power consumption circuit so that it can save the electrical energy.3 The volume increasing circuit has been designed in the internal part. Under the action of the magnet mode, the communication distance can achieve 35 kilometers when the weight-light coated cables are used. 4 It has the functions of the receiving ringing, the number-dial-up and the voice communication, Under the action of the magnet mode, it has the functions of the transmitting ring and detecting circuitry.Main Technical Specifications:1 Dimensions: 237mm×132mm×90mm 2 Weight≤2000g3  Operating temperature:-40℃～+55℃4 Operating mode: magnet and common battery Operating modes.5  Power Supply: magnet mode:4.5V (3 pieces of the dry battery), the common battery can be connected with the 24V～60V exchange.6  Relative Humidity: 40℃ max(93±2)%