Bluedio R2 stereo headset is a unique and revolutionary design combination. It"s a wise choice for the professional users. 1) Powerful 8 neodymium dynamic drive units by Bluedio Lab Composed of 2 woofers (50mm 50Ω) and 6 3D speakers (13mm 32Ω). 2) Bluetooth 4.0 low energy technology Up to 1300hrs ultra-long standby time and up to 20hrs working time. 3)PPS8 (Physical Position Surround Sound) & Lossless transmission technology aptX® Let you immerse yourself in the music world. 4)Maxim Amplifier Bluedio R2, equipped with Maxim Amplifier, can dispose the source of the sound efficiently and present you excellent real tone. 5) Classic & Concise Design: Simplified but not Simple With top LG ABS+PC shell and exquisite electroplating technology, R2 can surely demonstrate your exceptional taste! R2 Technical Specifications: Bluetooth Version: V4.0 Support: aptX® A2DP v1.2、AVRCP v1.4、HSP v1.2、HFP v1.6 RF Frequency Range: 2402 ~ 2480MHz（ISM BAND） Transmitting Power: Class2 RF Sensitivity: Package Includes: Bluedio R2 Stereo Headset*1pcs 1.5m 3.5mm Audio cable*1pcs USB charging cable*1pcs User"s guide*1pcs Pouch*1pcs