Main Features: Bluetooth: V4.1 + EDR High quality materials, lightweight body allows you to wear more comfortable It has built-in high-quality battery Compatible with various brands of Bluetooth phones and Bluetooth notebooks, tablet PCs, MID, etc. Brand: Bluedio Model : Bluedio HT Color : White, Black Wearing type : Headband Feature: Wireless Headphone Function : Microphone, Answering phone, Bluetooth Connectivity : Wireless Connecting interface : Micro USB Application : Sport, Mobile Phone Power supply: Built-in rechargeable battery Working time: 45 hours Bluetooth: Yes Bluetooth version: V4.1 Bluetooth mode: Hands free, Headset Package weight: 0.536 kg Product size (L x W x H) : 18.6 x 8.5 x 20 cm / 7.3 x 3.3 x 7.8 inches Package size (L x W x H) : 21 x 22 x 9 cm Package contents: 1 x Bluetooth Earphone, 1 x USB Cable, 1 x Audio Cable, 1 x English / Chinese User Manual Brand: Bluedio Model : HT Color : Black, White, Red, Blue Wearing type : Headband Feature: With FM Function and TF Card Slot Function : FM function, Answering phone, MP3 player, Bluetooth, Song switching, Microphone, HiFi Headset type: Dynamic Connectivity : Wireless Connecting interface : Micro USB, 3.5mm Application : Mobile Phone, Computer Plug interface: TF card slot, ANT-IN, Micro USB, Bluetooth Cable length : No Driver unit: 57mm Sound channel: Two-channel (stereo) Frequency response : 20~20KHz Impedance : 16ohms Sensitivity : 110 dB Working time: Talking time: About 45 hours, Music playing time: Around 40 hours Standby time: As long as 1625 hours Charging time: About 2 hours FM radio: Yes Bluetooth: Yes Bluetooth version: V4.1 Bluetooth protocol: AVRCP, HSP, HFP, A2DP External memory: TF card Package weight: 0.536 kg Product size (L x W x H) : 18.60 x 8.50 x 20.00 cm / 7.31 x 3.34 x 7.86 inches Package size (L x W x H) : 21.00 x 22.00 x 9.00 cm / 8.25 x 8.65 x 3.54 inches Package contents: 1 x Bluetooth Earphone, 1 x USB Cable, 1 x Audio Cable, 1 x English-Chinese User Manual