Hands-free Hotline Telephone KNSP04


KNSP-04  IP66 weatherproof hotline phone with a single metal auto-dial call button provides hand-free communication at all times

Push-to-call without a keypad, the auto-dialling hotline phone is connected automatically.

Designed for use for both internal and external use in dusty, wet, corrosive, noisy, harsh environments, but also in buildings and public locations.

Made from aluminium alloy material by die casting, the weatherproof telephone is both rugged and durable. Special sealing design ensures complete waterproof and grade up to IP66 weatherproof, dust-proof and moisture-resistant, even when the door enclosure is open.

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KNSP04  Hands-free Emergency Telephone is reliable, even within the most extreme environments...

Push-to-call without a keypad, the auto-dialling hotline phone is connected when the user presses the call button. A wall mounted watertight telephone designed for business, emergency, service and public use with an industrial durable design; manufactured from tough aluminium alloy, as a result this provides a high degree of durability and corrosion resistance. Supplied with tamper proof components, fixing and mounting bars, including optional hearing aid loop and noise cancelling microphone, the KNSP04 hands-free hotline telephone remains in service at all times. 

Pained with industrial powder coated in UV stabilised polyester finish (optional colours available) and covered with a layer of permanent reflective phone label for easy identification. 5-10 years not fading, completely conforms to the standard GB/T5237.2-2000

Used widely throughout industry

KNSP04 emergency hands-free hotline telephones maintain 24/7 communications where reliability is essential.

Widely used in factories, tunnels, bridges, power plants, highways and with underground and high-speed rail projects when industry requires heavy duty and reliable communications. Also for public outdoor emergency communications points, such as holiday parks for emergency and service backup….  The weatherproof harsh environment telephone is also available in emergency orange, red and blue colours (on demand).

For use in extreme temperature environments, fully functional between -30 ~ +60 degrees, where temperature is a concern. Fully operational in relative humanity :10%~95%  and also in high atmospheric pressures: 86~106 Kpa. MTBF: 100,000 hours

Call transmission index:(5KM)SLR<12,RLR<-1,STMR>10, output impedance is 600 Ohm. maximum distance: 7KM

Photo of the standard function of the KNSP04 Hands-free Telephone

Features designed specifically for the needs of the user

When a emergency situation or disaster occurs and people’s lives are at risk, it is vitally important emergency telephones are fully functional, ready to communicate loud and clear. KNSP Series telephones tick all the boxes.

Optional hearing Aid Loop, an essential requirement for hard of hearing users. A noise cancelling microphone prevents interference from background noise, as is frequently a problem, this includes heavy industrial, highways and high wind locations.

Featuring a loud ringer  + 70dB(A) @ 1m, with further options to add further KNSP acoustic or visual call alerter’s, to provide extended call indication.

Remote Status Monitoring

Integrity wiring enables the control room to check if the telephones are full operational (providing the IP PBX or PABX have this feature available, we can provide this function), this is a simple to use systems. KNSP dispatch and management system phones are also available to ensure complete coordination from control rooms.

Version Availability

KNSP04 hands-free hotline telephones are available to VoIP SIP PoE (Power over Ethernet) RJ45 connection or analogue connection, powered by analogue line. Connection: RJ11 screw terminal pair cable (or RJ11 Socket of plug upon request)


KNSP-04 meets the latest UK and European standards CE Mark, EMC, RoHS, lightening protection and with a wide operating temperature range, it is built for long term high reliability of operation.

EN55022: emissions EN55024: immunity

Ingress Protection: GB4208-93 IP66 FCC ITU-T Recommendations K21

EMC: EN50121(Railway application-Electromagnetic Compatibility)

Certifications and conformity, CE, FC, IP66 and RoHS

Internal Relay’s.

Optionally (On Demand), up to 3 internal relays can be installed within the telephone itself and additional control buttons for local control. Remote users can dial the phone and enter PIN codes from their telephone keypad for remote commands. E.G. door / gate open or close, sound an alarm, switch on a camera / light etc.

Features available for customisation at factory level, feel free to contact us with your requirements. 


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Product Catagories

SPECIFICATION – Analogue(Model NO.SP0010012)

1. PSTN analogue telephone

2. DTMF dialing

3. MTBF:100000hours

4. MTTR: 2 hours

5. Connection: RJ11 screw terminal pair cable

6. Sound level of ringing:over 70dB(A).

7. Call transmission index:(5KM)SLR<12,RLR<-1,stmr>10, output impedance is 600 Ohm.maximum distance: 7KM

8. Applicable for various types of SPC exchange PABX and dispatching exchange system with feeding voltage of 33-60V.

9. Connection: RJ11 screw terminal pair cable (or RJ11 Socket of plug upon request),with stainless steel cable protected

10. Super strong function is available for dialing 12 groups of numbers stored in the memory,(maximum length of each number is 16 digits)

11. Standard frequency:low frequency group:697. 770. 852. 941Hz,high frequency group:1209. 1336. 1477Hz, frequency deviation:-1.5% ~ +1.5%

12. Ambient temperature:-30 ~ +60 degree. Relative humidity: 10%~95% Atmospheric pressure: 86~106 Kpa Circumstance noise: less than 60 dB (A)


1. VoIP SIP2.0 telephone

2. DTMF dialing

3. MTBF100000hours

4. MTTR: 2 hours

5. Auxiliary Contacts:1 Aux Output, dry contact

6. Rated load:0.3 A at 125 VAC; 1 A at 30 VDC

7. Contact Ratings. Load: Resistive load

8. Echo cancellation code:G.167/G.168

9. Rated carry current:1A

10. Max.switching current:1A

11. Max.switching voltage:125 VAC,60VDC

12. Audio Codes:G.711, G.722, G.729

13. IP Protocols:IPv4, TCP, UDP, TFTP, RTP, RTCP, DHCP, SIP

14. Free dial (maximum length of each number is 16 digits)

15. Communication: Full duplex 2-way hands-free communication

16. Call Control Signaling:VOIP SIP Info(DTMF), RFC 2833(DTMF)

17. Network:10/100 BaseTX Ethernet, RJ45 connectors, Cat5e or better

18. Power:Power over Ethernet, IEEE802.3af, Class 0  Local power, 12VDc,Idle 2W, Max 10W

19. Programming:Non-volatile flash memory programming and configuration through Web GUI

20. Management and Operation: DHCP and static IP, remote automatic software upgrade, centralised monitoring, status LED

21. LAN Protocols:Power over Ethernet(PoE,802.3af), WLAN(IEEE 802.3af), Network Access Control(IEEE 802.1x),STP(IEEE 802.1d), RSTP(IEEE 802.1d-2004)

PACKAGING – KNSP10 Weatherproof  Hands-free Hotline Telephone

Packaging and accessories included within the KNSP04 telephone

Unit size:320 *205*120mm   Unit: N.W:5.3KG

1pcs packing box size: 439 *277 *191mm Unit: N.W:5.3KG    Unit G.W:7KG

6pcs in 1 outer Carton box: size: 730*390*340mm  N.W:31.8KG  G.W:34KG


Complete VoIP / Analogue Communication Systems for Industry

Delivering full communication and managements systems designed to meet your requirements

Weatherproof hands-free telephones used widely throughout industry

Industries that use the KNSP04 phones, including tunnels, metro, power plants, mines, highways and terminals

For further information, please contact us.






Additional information

Weight 6 kg
Dimensions 45 × 30 × 20 cm


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