A dedicated WiFi calling phone for children, with physical buttons, three-letter LED contact labels and parent-managed contacts. Designed for kids phone brands, family calling services and OEM/ODM projects.
Three-letter LED contact labels, such as “MOM” or “DAD”
App-managed whitelist and incoming/outgoing calling permissions
Bluetooth-assisted setup through a mobile phone
Independent SIP calling over 2.4GHz and 5GHz WiFi after configuration
No SIM card or traditional telephone line required
Demo software available for sample testing
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Simple Family Calls, Without a Smartphone.
KS21 gives children a dedicated home phone for calling parents, grandparents and other approved contacts. Children use physical buttons for everyday calls, while parents manage contacts and calling permissions through the supporting mobile app.
A small LED dot-matrix display shows contact labels of up to three letters. Labels such as “MOM” and “DAD” help children recognize familiar callers without navigating touchscreen menus.
The device focuses on voice communication, with no web browser, app store, social media or games.
Set short LED labels for approved contacts to help children identify callers. KS21 provides basic contact information without a conventional LCD or touchscreen.
Parents or administrators can manage the contact whitelist and configure incoming and outgoing calling permissions through the supporting mobile app. Children use the phone without handling account or permission settings.
A physical keypad, volume controls and WiFi/SIP status indicators keep operation straightforward. Children can make and receive calls without using a companion app.
Use a mobile phone to discover and connect to KS21 over Bluetooth, then configure WiFi and other supported settings.
KS21 supports 2.4GHz and 5GHz WiFi and one SIP account. Supported audio codecs include Opus, G.722 and G.711, with automatic echo cancellation.
SIP registration, call routing and audio performance can be tested with the customer’s calling system before deployment.
KS21 supports web-based device management and OTA firmware updates. Additional configuration functions and customer app requirements can be reviewed during project evaluation.
KS21 uses the customer’s SIP system for account assignment and calling. A mobile phone is used to complete setup and manage supported settings.
Connect over Bluetooth
Configure WiFi
Assign the SIP Account and Phone Number
Configure Contacts and Calling Permissions
Start Independent Calling
KAER provides demo software for sample evaluation. Our technical team will explain the supported setup functions and help customers test KS21 with their SIP system.
For customers developing their own app, we can review the required configuration functions and discuss integration requirements.
Planning a kid SIP phone project? KAER supports product branding, firmware customization and SIP platform integration.
We work with kids phone brands, family communication businesses, SIP service providers and private-label customers. Our in-house development and manufacturing teams can review the following requirements:
Area | Customization & Integration Support |
|---|---|
Appearance & Branding | Product colors, logo and packaging |
SIP Integration | Account settings, server configuration and platform compatibility testing |
Contact Controls | Contact labels, whitelist behavior and calling rules |
Parent App | App adaptation and supported configuration functions |
Firmware | Function customization and localization |
Share your target country, SIP system, required functions and estimated quantity. KAER will review feasibility and confirm the sample plan, customization scope, MOQ, development costs and production lead time.
KS21 provides a dedicated calling device for children at home, within configured WiFi coverage. Brands and family calling service providers can offer the phone alongside their SIP service, account setup and customer support.
Schools, Montessori environments and childcare centers can evaluate KS21 for supervised indoor communication with parents and caregivers. Before deployment, buyers should confirm whether devices will be shared or individually assigned, who will manage contacts, and how the phones will connect to the intended SIP system.
Does KS21 have a screen?
KS21 has no conventional LCD or touchscreen. It uses an LED dot-matrix display to show contact labels of up to three letters, such as “MOM” or “DAD”. It does not display full contact names or smartphone-style content.
Does KS21 need a SIM card or a calling service?
Does the mobile phone need to stay connected?
Who manages contacts and calling permissions?
Can we test KS21 before customization?
Can we use our own SIP system or parent app?
What is the difference between KS21 and KS22?
Evaluate KS21 with your SIP system before moving to customization or a larger order.
Send KAER your target market, SIP platform, estimated quantity and required functions. Our team can arrange samples and demo software, and help you plan checks for setup, call quality, contact labels and calling permissions.
