Stereo Bluetooth Headset with Frequency of 2.4 to 2.4835GHz ISM Band ?Chipset: CSR/BC352239A ?Bluetooth version: 2.0/Class2 ?Operating distance: 10m ?Range of frequency: 2.4 to 2.4835GHz ISM band ?Operating range: up to 10m ?Typical talk time: eight hours ?Typical standby time: 160 hours ?Sensitivity: <-80dBm (PER 1%) ?Rechargeable Lithium battery: 160mAh ?Compatible with various Bluetooth enabled devices such as mobile phones, PDAs ?and laptops ?Colors: black/red