{"product_id":"gsm-4-way-extension-lead-audio-monitor","title":"GSM 4-Way Extension Lead – Voice Monitoring \u0026 Call-Back Function","description":"\u003ch4 style=\"text-align: center;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eGSM 4-Way Extension Lead Audio Monitor with Voice Monitoring and Call-Back Function\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003eThis\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/spygeardirect.co.uk\/collections\/gsm-listening-devices\"\u003eGSM 4-way extension lead\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eis a mains-powered audio monitoring device built into a working 4-way power adapter for authorised use where local laws, permissions, and consent requirements are fully met. Designed for fixed indoor placement, it combines everyday extension lead functionality with GSM-based remote audio monitoring, allowing users to carry out audio check-ins through a compatible voice SIM and supported GSM network bands. Because it operates from continuous mains power, it is suited to longer-term use without the need for battery charging.\u003c\/p\u003e\n\u003cp\u003eBuilt for simple ongoing operation, this GSM extension lead supports remote audio access by phone call, voice-activated call-back alerts when sound is detected, and SMS-based control for selected settings. The stated dual microphone design supports audio pickup at distances of up to 10 metres, while quad-band GSM support is listed for broader network compatibility. For users who need a mains-powered GSM audio monitor in a properly authorised indoor environment, it offers a practical fixed-location setup in a familiar extension lead format.\u003c\/p\u003e\n\u003ch4 style=\"text-align: center;\"\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eWorking 4-way mains adapter: Functions as a standard 4-way extension lead while also housing GSM-based audio monitoring features.\u003c\/li\u003e\n\u003cli\u003eRemote audio check-in: Supports audio access by calling the installed SIM number through a compatible GSM network.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/spygeardirect.co.uk\/collections\/listening-devices\"\u003eVoice-activated call-back\u003c\/a\u003e: Can place an alert call to a saved number when sound is detected.\u003c\/li\u003e\n\u003cli\u003eContinuous mains power: Runs from wall power for extended operation without recharging.\u003c\/li\u003e\n\u003cli\u003eQuad-band GSM support: Listed as supporting 850, 900, 1800, and 1900 MHz bands.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/spygeardirect.co.uk\/collections\/spy-microphones\"\u003eDual microphone design\u003c\/a\u003e: Stated pickup range of up to 10 metres.\u003c\/li\u003e\n\u003cli\u003eSMS setting control: Allows selected functions such as call-back mode to be enabled or disabled by text.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eIdeal For\u003c\/h4\u003e\n\u003cp\u003eThis product is intended only for authorised indoor use where all applicable laws, permissions, and consent requirements are met. It may suit controlled environments where mains-powered GSM audio monitoring is required and where users need continuous power rather than battery-based operation. With remote audio check-in, call-back alerts, and SMS-based control, it is a practical option for fixed-location use in lawful and properly authorised settings.\u003c\/p\u003e\n\u003ch4\u003eWhat’s in the Box\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eGSM 4-way extension lead audio monitor\u003c\/li\u003e\n\u003cli\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNEED TO KNOW\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProduct type: GSM 4-way extension lead with audio monitoring features\u003c\/li\u003e\n\u003cli\u003ePower type: Continuous mains-powered operation\u003c\/li\u003e\n\u003cli\u003eGSM bands: 850, 900, 1800, and 1900 MHz\u003c\/li\u003e\n\u003cli\u003eMonitoring access: Remote audio check-in via GSM call\u003c\/li\u003e\n\u003cli\u003eAlert mode: Voice-activated call-back function\u003c\/li\u003e\n\u003cli\u003eControl method: SMS-controlled settings\u003c\/li\u003e\n\u003cli\u003eMicrophones: Dual microphones\u003c\/li\u003e\n\u003cli\u003eStated pickup range: Up to 10 metres\u003c\/li\u003e\n\u003cli\u003eUse condition: For authorised use only, subject to local laws and permission requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eDimensions\u003c\/h4\u003e\n\u003cp\u003e250 x 50 x 20 mm\u003c\/p\u003e\n\u003ch4\u003eWeight\u003c\/h4\u003e\n\u003cp\u003e450 g\u003c\/p\u003e","brand":"Spy Gear","offers":[{"title":"Default Title","offer_id":52622506197319,"sku":null,"price":90.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0907\/3324\/8839\/files\/ChatGPTImageOct25_2025_10_25_41PM.png?v=1761427554","url":"https:\/\/spygeardirect.co.uk\/products\/gsm-4-way-extension-lead-audio-monitor","provider":"SpyGear Direct","version":"1.0","type":"link"}