Your PC can't pair with the new headset, or the old Bluetooth card keeps dropping mid-call. The NB540 slots into any USB port and gets you connected in seconds. Bluetooth 5.4 means faster device discovery, lower power draw, and a solid 20-metre range for pairing keyboards, mice, headsets, speakers, printers, and phones. On Windows 10 or later, plug it in and you're done — no driver fiddling. Running Windows 7 or 8? Grab the driver from the CD or download it. One thing: uninstall any existing Bluetooth driver first so they don't fight each other in Device Manager
| brand | SIMPLECOM |
| model | NB540 |
| bluetooth_version | Bluetooth 5.4 |
| interface | USB 2.0 |
| transmission_range | Up to 20m (Class II) |
| operating_frequency | 2.402–2.480 GHz |
| sensitivity | -86dBm @ 0.1%BER |
| profiles | SPP, BLE, ANCS, HFP, HCRP, A2DP, AVRCP |
| edr_data_rate | Up to 3 Mbps |
| power_source | USB powered (5V) |
| dimensions | 22 x 14 x 6 mm |
| operating_temperature | 0°C – 40°C |
| operating_humidity | 10%–90% RH (non-condensing) |
| supported_os | Windows 7, 8, 10, 11 (32/64-bit) |
