wireless bluetooth 4.2 receiver and transmitter audio aux music stereo adapter

model: kn319 technologies: bt4.2, a2dp, avrcp (receiver mode only) operation range: up to 10m / 33ft (without any blocking objects) charging time: 2 hours continuous use time: 6 hours (receiver mode) / 5 hours (transmitter mode) battery type: li-polymer (200mah) dimensions: 44 × 44 × 12mm weight: 18g