{"product_id":"rolton-k400-voice-amplifier-headset-microphone-kit","title":"Rolton K400 Voice Amplifier with Headworn Microphone Kit","description":"\u003ch2\u003eRolton K400 Portable Voice Amplifier with Headworn Microphone\u003c\/h2\u003e\n\u003cp\u003eStep up your presentations, lessons, and guided tours with the \u003cstrong\u003eRolton K400 Mini Voice Amplifier Kit\u003c\/strong\u003e. This compact, wearable loudspeaker delivers over \u003cstrong\u003e5W of clear, powerful audio\u003c\/strong\u003e — perfect for teachers, tour guides, fitness instructors, meeting facilitators, and anyone who needs hands-free projection of their voice. The included professional wired headset microphone sits comfortably over your ear, leaving your hands completely free.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5W+ Audio Power\u003c\/strong\u003e — Clear, room-filling sound without distortion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1200mAh Rechargeable Battery\u003c\/strong\u003e — Up to 8 hours of continuous use on a single charge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Charging\u003c\/strong\u003e — Charges via any standard USB 5V charger (mobile phone charger compatible); charger current \u0026gt;500mA recommended\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB \u0026amp; TF Card Playback\u003c\/strong\u003e — Stream music or audio directly from a USB drive or TF\/microSD card\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOmnidirectional Condenser Microphone\u003c\/strong\u003e — Captures your voice clearly from all angles with a comfortable headworn fit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Knob Volume Control\u003c\/strong\u003e — Simple, intuitive dial for on-the-fly volume adjustments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWaist-Belt Clip Included\u003c\/strong\u003e — Clip the compact speaker to your belt or waistband for true hands-free portability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWired Connection\u003c\/strong\u003e — Reliable, interference-free audio every time\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Use Design\u003c\/strong\u003e — Ideal for teaching, tour guiding, promotions, fitness classes, and meetings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Rolton K400\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAudio Power:\u003c\/strong\u003e \u0026gt;5W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Capacity:\u003c\/strong\u003e 1200mAh (detachable 18650 cell)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlay Time:\u003c\/strong\u003e ~4–8 hours (at 50–80% volume)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging:\u003c\/strong\u003e Standard USB 5V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePolar Pattern:\u003c\/strong\u003e Omnidirectional\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransducer:\u003c\/strong\u003e Condenser\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e Wired\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e H 8.5cm × W 8.5cm × D 3.4cm (approx. 3.3\" × 3.3\" × 1.2\")\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Rolton K400 Loudspeaker\u003c\/li\u003e\n  \u003cli\u003e1 × 1200mAh Rechargeable Battery\u003c\/li\u003e\n  \u003cli\u003e1 × Professional Wired Headset Microphone\u003c\/li\u003e\n  \u003cli\u003e1 × USB Charging Cable\u003c\/li\u003e\n  \u003cli\u003e1 × Waistband Belt Clip\u003c\/li\u003e\n  \u003cli\u003e1 × Instruction Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGreat for\u003c\/h3\u003e\n\u003cp\u003eClassroom teachers, school coaches, fitness instructors, museum and tour guides, event promoters, corporate trainers, and anyone who needs amplified, clear voice projection without being tethered to a podium or bulky PA system.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More Audio \u0026amp; Electronics\u003c\/h3\u003e\n\u003cp\u003eCheck out other great picks from our store:\u003cbr\u003e\n\u003ca href=\"\/products\/1-channel-mini-hd-video-encoder-hdmi-to-ip-rtmp-srt-hls-rtsp-h265-h264-iptv\"\u003e1-Channel Mini HD Video Encoder – HDMI to IP RTMP SRT HLS H.265\u003c\/a\u003e\u003cbr\u003e\n\u003ca href=\"\/products\/1-32-inch-amoled-smart-watch-bluetooth-call-fitness-tracker-ios-android\"\u003e1.32\" AMOLED Smart Watch – Bluetooth Call, Fitness \u0026amp; Health Tracker\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003eFor guidance on safe use of personal audio equipment and hearing-related considerations, visit the \u003ca href=\"https:\/\/www.cdc.gov\/niosh\/topics\/noise\/default.html\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCDC's Noise and Hearing Loss Prevention resource\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: How long does the Rolton K400 voice amplifier battery last on a full charge?\u003c\/h4\u003e\n\u003cp\u003eA: The 1200mAh rechargeable battery provides up to 8 hours of use. When playing music at 50–80% volume, expect approximately 4–8 hours of runtime. The battery is detachable (18650 format), so you can carry a spare for extended sessions.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What type of microphone comes with the Rolton K400 kit?\u003c\/h4\u003e\n\u003cp\u003eA: The kit includes a professional wired headworn (headset) condenser microphone with an omnidirectional polar pattern, meaning it picks up your voice clearly regardless of the angle. It sits comfortably over your ear, keeping your hands free.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I play music through the Rolton K400 speaker?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The Rolton K400 supports both USB drive and TF (microSD) card playback, so you can play background music, instructional audio, or any audio files directly through the built-in speaker — no phone or Bluetooth connection needed.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I charge the Rolton K400 voice amplifier?\u003c\/h4\u003e\n\u003cp\u003eA: Charging is simple — use any standard USB 5V charger (such as a smartphone charger) with the included USB charging cable. For best results, use a charger with a current output greater than 500mA.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How long does the Rolton K400 voice amplifier battery last on a full charge?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 1200mAh rechargeable battery provides up to 8 hours of use. 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The Rolton K400 supports both USB drive and TF (microSD) card playback, so you can play background music, instructional audio, or any audio files directly through the built-in speaker — no phone or Bluetooth connection needed.\"}}, {\"@type\": \"Question\", \"name\": \"How do I charge the Rolton K400 voice amplifier?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Charging is simple — use any standard USB 5V charger (such as a smartphone charger) with the included USB charging cable. 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