Specification:
Model number: JRBC08
BT version: CSR V4.0
Battery capacity: 180mAh li-poly
Charging time: 2 hours
Playing time: 6 hours
Stand-by time: 30 days
Effective distance:10 meters / 33feet
Speaker type: Bone conduction speaker
Frequency range: 100Hz~18KHz
Sound pressure level(SPL): 88dB
Microphone: -42dB
Item weight: Approx. 77g / 2.7oz
Package size: 13.2 * 12.5 * 4.2cm / 5.2 * 4.9 * 1.7in(L * W * H)
Package weight: 221g / 7.8oz

Tips for getting a better BT signal:
Place the headphone in a open range within 10m from the BT device without any barrier or metallic gadget.

Package list:
1 * BT Bone Conduction Sports Headphone
1 * USB Charging Cable
1 * Carry Bag

1 * User Manual(English)