NIA WH260 NIA WH260BT Over-Ear Wireless Bluetooth Headphones Bluetooth Headphones with Card Play and FM Radio Bluetooth is the communication system. Version of specifications: V5.0 Battery Backup time: eight to ten hours 1 to 1 1/2 hours for charging Maximum time spent communicating: 10M Compliant profiles for Bluetooth: A2DP, AVRCP, HFP, and HSP Card Multiple decoding: WAV/WMA, MP3/ Range of radio frequencies: 87.5-108 MHz Diameter of speaker: NdFeB 40 mm 32 ohm speaker impedance Response frequency: 20–20,000 Hz CATEGORIES: nw8745 Headsets