Product introduction
The  hands-free waterproof public address telephone supports the standard SIP protocol and can be effectively compatible with the commonly used IPPBX and network dispatching platform in the market. It is a special telephone specially developed for high humidity and high dust environments such as subway tunnels, underground pipe gallery tunnels, highway tunnels, mines and mines, power plants and power plants, steel plants, ports, ships and electrolytic workshops. It is suitable for long-term installation in various harsh environments and is waterproof, moisture-proof It has the characteristics of dust prevention, cold prevention, frost resistance, high temperature resistance, oxidation resistance, corrosion resistance, and violence resistance.

Product features
1. Aluminum alloy material, formed by more than 1000 tons of die-casting machine, has high density, light weight, and is characterized by cold and frost resistance, oxidation resistance, corrosion resistance, and resistance to violent impact;
2. Hands free design, the button is made of 304 stainless steel, with blue light indicator light, and one key speed dial button is set;
3. The speakers shall be high-quality industrial speakers, and the back of the external speaker holes shall be equipped with anti piercing stainless steel mesh, which can effectively protect the speakers from damage;
4. The keys are made of anti-aging silicone material, professionally designed to be waterproof and dust-proof, and matched with gold plated PCB board. They have good hand feel, good electrical performance, and a service life of ≥ 500000 times;
5. The telephone motherboard is developed by using imported single chip computers and the chips grinded by the company. All components are SMT chip mountings, which have rich functions and high integration. Two dry node interfaces are reserved for one off and one off to enhance the linkage with external equipment;
6. The phone shell adopts multiple waterproof design, all incoming lines are sealed with professional anti-aging waterproof electronic glue, and the overall protection level of the phone reaches IP68;
7. As required, the ring can be moved outside the shell to solve the problem that the ring tone of similar products in the market is too small, which causes that the ring tone cannot be heard when being called.

Function introduction of the phone (please confirm the specific functions before leaving the factory due to the high integration of the motherboard)
1. Public address function: when the phone is in the called state, the ringing sound will be amplified and transmitted through the loudspeaker. If no one answers after 3-5 rings, the phone will automatically answer, and the caller's voice will be amplified through the loudspeaker to achieve live broadcasting;
2. Ordinary dialing: press the hands-free button and dial automatically through the keyboard;
3. One touch dialing: The phone supports up to four groups of number storage (including one touch speed dial button), and the number will be permanently saved after setting, and will not be lost in case of power failure. When in use, "Pick up the phone ->select the key to store the number" to dial out;
4. Automatic dialing: After pressing the handsfree button, the phone will automatically dial a group of pre stored numbers;
5. Cyclic dialing: After pressing the hands-free button, the first group of numbers will be dialed automatically. If the line is busy or no one answers, it will be transferred to the second group. When the line is still busy or no one answers after dialing the last group, it will be automatically transferred back to the first group until someone answers or hangs up. Up to 5 groups of numbers can be stored;
6. Automatic hang up: after the call is over, the local phone will automatically detect the busy tone signal and reverse limit signal of the switch, and hang up after several confirmations;
7. Voice adjustment: The telephone has two levels of volume adjustment. Low pitch, this mode uses the telephone line for direct power supply, the volume is 60~70dBA, and the effective hands-free distance is 0.1~0.2m; High pitch, this mode needs to be connected to 220V power supply or 6~12V DC power supply, and the volume is ≥ 90dBA. After testing, the effective hands-free distance is 0.8m~1m under the environment noise of 80dBA; The factory default is the second gear, that is, 220V power supply is required;
8. Linkage function: the telephone has two open nodes, one on and one off. When the telephone is off/on, the two trunk nodes provide two groups of pulse switching signals, one on and one off;
9. Support OEM OEM service, and customize LOGO logo and packaging instructions as required;
10. More functions can be customized according to requirements. Please communicate with the company's business personnel in advance to ensure that the phone can meet your needs.

Specific parameters

Structure Diagram

installation diagram

a. Fix the telephone on the installation backplane with matching M8 bolts;
b. Drill 4 holes on the wall according to the hole position shown on the installation backplane Φ 10 holes (225.5 * 140mm), and then insert explosive screws into the holes;
c. Fix the telephone and the installation backplane on the wall with matching nuts;
d. Connect the power cord, optical fiber and loudspeaker cable (loudspeaker cable) according to the outgoing cable label;
E. Fix the loudspeaker at a proper position and complete the installation.

Product packaging specification
Specification: 1 set/box
Gross weight: 8.0 KG
Net weight: 7.0KG
Packaging: pearl cotton, carton