VT9800 Dual +BT50U

Here are the quick specs for the VT9800 Dual (Duo) + BT50U Bluetooth headset:

🎧 General

• Model: VT9800 Duo / Mono Bluetooth Headset
• Bluetooth version: 5.0 (Class 1, up to 30 m / 100 ft range)
• Weight: ~144 g
• Dimensions: 155 × 36 × 180 mm

Audio & Microphone

• Speakers: 40 mm, wideband (music mode 20 Hz–20 kHz / comms mode 150 Hz–6.8 kHz)
• Sensitivity: ~110 ± 3 dB (speaker), mic sensitivity –38 ± 3 dB
• Microphone: Uni-directional boom with ENC (Electronic Noise Cancellation), PNC passive cancellation

Battery & Charging

• Talk time: Up to 15 hours
• Charging time: ~3 hours via USB-C
• Standby time: ~240 hours

Functionality

• Dual Bluetooth connectivity: Pair with two devices simultaneously (e.g., phone + PC)
• Busylight: Red LED indicators during calls to signal “do not disturb”
• Controls: Buttons for power, call answer/end, mute, volume up/down, on-ear hook off/on

Compatibility

• With mobile devices and PCs
• Pre-paired with Microsoft Teams / Skype for Business via BT50U USB dongle (USB-A/C adapter optional)

Environmental & Physical

• Head cushion: Leatherette ear pads, adjustable headband
• Operating temp: –10 °C to +55 °C
• Storage temp: –20 °C to +25 °C
• Charging cable: ~1.2 m USB-C to charge while in use

Summary
The VT9800 Duo is a lightweight, professional-grade Bluetooth headset with dual-device connectivity, noise-cancelling mic, and an integrated busy-light—ideal for hybrid workers. It supports long 15-hour talk sessions and pairs seamlessly with PC softphone platforms using the BT50U dongle.