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KS21 Screen-Free Kids WiFi SIP Phone with LED Contact Labels

No conventional LCD or touchscreen. Only simple LED contact labels to help children recognize approved callers.

Three-letter LED contact labels
Contact whitelist managed through the mobile app
Configurable incoming and outgoing calling permissions
App-free operation for children
SIP calling over 2.4GHz and 5GHz WiFi
Physical keypad for straightforward daily use
SIP platform integration and OTA firmware upgrades


Model:	KS21
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General Details

Technical Data

Introduction

Simple Calling

KS21 is a WiFi SIP phone designed for children who need a simple way to call parents, grandparents and other approved contacts without using a smartphone.

Instead of a conventional LCD or touchscreen, it uses an LED dot-matrix display to show configurable contact labels of up to three letters, such as "MOM" or "DAD". This helps children recognize the caller without introducing touchscreen menus or smartphone-style content.

Parents or administrators use the mobile app to configure contacts and calling permissions. Children use the physical phone directly and do not need an app.
Easy to Use

KS21 combines a physical keypad with a limited LED dot-matrix display.

The display provides the basic information needed during a call, while the keypad, volume controls and status lights keep everyday operation straightforward. Children do not need to navigate touchscreen menus or manage an app.

The child-facing device does not provide an app store, social media feed, game interface or web browser.

Key Features

Contact Controls

• Configurable LED contact labels of up to three letters
• Mobile app configuration for parents and administrators
• Contact whitelist management
• Configurable incoming and outgoing calling permissions
• App-free operation for children
• Physical keypad and dedicated function controls
WiFi & SIP

• SIP/VoIP communication over WiFi
• IEEE 802.11 b/g/n/ac/ax with 2.4GHz and 5GHz support
• One SIP account with incoming and outgoing calling functions
• Opus codec for clear, bandwidth-efficient voice transmission
• Compatibility with SIP-based IP PBX, Softswitch and IMS platforms
• Web-based management and remote provisioning support
• OTA firmware upgrades for remote maintenance

Applications

Family Communication

KS21 gives children a fixed phone for calling parents, grandparents and other approved contacts at home. Short LED labels such as "MOM" or "DAD" help them recognize the caller at a glance. Parents manage contacts and calling permissions through the mobile app, while children use the phone without an app, social media, games or web browsing.

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Schools & Childcare

KS21 can also be used in Montessori schools, childcare centers and other supervised indoor settings. Its physical controls, contact whitelist and WiFi SIP connection support managed communication with parents, teachers and caregivers. Administrators can configure approved contacts and calling permissions according to project requirements.

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OEM & ODM Solutions

KAER provides OEM and ODM support for kids phone brands, communication service providers and private-label projects.

Customers can discuss their product requirements with our sales team. Based on the intended market, SIP platform, calling rules and required functions, our technical team will evaluate the feasibility of the project.

Common customization requirements may involve:

• Product colors, logo and packaging
• SIP account and server configuration
• Customer platform or server integration
• Contact labels and calling-rule settings
• Mobile app adaptation
• Firmware customization and localization

The available functions and customization scope depend on the technical requirements of each project. MOQ, development cost and lead time are confirmed after technical evaluation.

KS21 is suitable for projects that require simple contact identification without adding a conventional LCD or touchscreen.

Suitable for Kids Phone Brands and Service Providers

KS21 is intended for businesses developing a focused communication product for children rather than a general-purpose smartphone.

Potential customers and projects include:

• Kids phone and family technology brands
• Child-focused product startups
• Family calling and subscription services
• SIP and telecom service providers
• Schools and childcare communication projects
• Private-label retail projects

KAER provides in-house product development, manufacturing and technical support for overseas OEM and ODM projects.

FAQs

Does KS21 have a screen?

KS21 does not have a conventional LCD or touchscreen. It uses a simple LED dot-matrix display made from individual light points.
What does the LED display show?

The display shows configurable contact labels of up to three letters, such as "MOM" or "DAD". It does not display full contact names, phone numbers or smartphone-style content.
Does KS21 require a SIM card?

No. KS21 connects to a compatible SIP service through a 2.4GHz or 5GHz WiFi network. It does not require a SIM card or traditional telephone line.
Can parents manage the contact whitelist?

Yes. Parents or administrators can use the mobile app to set contact labels, manage the contact whitelist and configure incoming and outgoing calling permissions. Children do not need to use the app.
Can KS21 connect to our SIP platform?

KS21 supports SIP-based communication. SIP compatibility, account configuration and platform requirements can be checked during sample testing.
What is the difference between KS21 and KS22?

KS21 uses an LED dot-matrix display to show three-letter contact labels. KS22 has no display and uses a physical rotary-style dialing interface.
Both models support WiFi SIP calling, mobile app configuration and app-free operation for children.

Discuss Your KS21 Project

Planning a kids phone, family calling service or focused communication product for children?

Contact our sales team to discuss your target market, SIP platform, expected functions, estimated quantity and customization requirements. Our technical team will evaluate the project and confirm the available solution.

A KS21 sample can also be provided for testing the LED contact labels, mobile app configuration, contact whitelist and SIP compatibility.

Parameter		Details
Complete Machine	Reference Dimensions	Main unit: 1725032mm Base: 1727927.5mm
Complete Machine	Case Material	ABS + TPU
SIP	Audio Parameters	HD Voice
		Encoding/Decoding: G.711/722/729, AMR-NB/WB, iLBC, Opus
		With automatic echo cancellation
		DTMF: In-band,Out-of-band,SIP INFO
	Phone Features	Supports 1 SIP account
	Phone Features	Incoming/outgoing calls ; caller ID, ringtone
	User Interface	SIP status indicator light, WiFi status indicator light
	User Interface	SIP status indicator light, WiFi status indicator light
	Network & Security	Supports SIP v1 (RFC2543) and SIP v2 (RFC3261)
		Supports NAT: STUN, TURN, ICE
		Supports RTP/RTCP/SRTP
		Supports Qos
		Supports IPv4 and IPv6
	Configuration Management	Supported configuration modes: WEB
		Restore factory settings and restart
		OTA
Network	WiFi	802 b/g/n/ac/ax, 2.4GHz & 5GHz
Voice	Trumpet	1
Voice	MIC	1
Power Supply	Input	AC 100~240V
Power Supply	Output	DC 5V / 1A
Other	Operating Humidity	10%-95%
	Atmospheric Pressure	86-106 kPa
	Operating Temperature	- 0 ℃ - + 45 ℃
	Storage Temperature	-20℃ - +60℃

General Details

Technical Data

KS21 Screen-Free Kids WiFi SIP Phone with LED Contact Labels

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