JVC HA-FX21BT-AE Colourful wireless inner-ear headphones, Wireless, 20 - 20000 Hz, 11 g, Headset, Blue JVC HA-FX21BT-AE Colourful wireless inner-ear headphones. Product type: Headset. Connectivity technology: Wireless, Bluetooth. Headphone frequency: 20 - 20000 Hz. Wireless range: 10 m. Weight: 11 g. Product colour: Blue