Specification: Item Type: Neckband Monitor Headphone Material: ABS Headphone Receiver: Frequency Band Mode: 2.4G Battery Life: 9H Transmission Distance: >10m/32.8ft Dongle Transmitter: Frequency Band Mode: 2.4G Battery Life: 10H Transmission Distance: >10m/32.8ft Built in Polymer Lithium Battery: 110mAh (Receiver), 220mAh (Transmitter) Package List:1 x Transmitter1 x Headphone Receiver 1 x Manual1 x Charging Cable About this item Ultra Low Latency: The neckband monitor headphone has ultra low latency within 20ms, and you can enjoy singing and band sound quality with the sound card. Long Battery Life: Wireless neckband monitoring headphone provides 9 hours of long battery life, no longer limited by battery life, suitable for stage, music studio, etc. Multipurpose: Multi function BT headset, can be inserted into the sound card device for live broadcast, karaoke, or used as a BT headset to connect to a mobile phone. Stable Signal: Wireless signal transmission of the neckband BT monitoring headset is stable, which perfectly solves the inconvenience of the wired method. Comfortable To Wear: Wireless monitoring earbud is neckband design, which can be worn for a long time without pressure. High quality ABS material, more durable. Ultra Low Latency: The neckband monitor headphone has ultra low latency within 20ms, and you can enjoy singing and band sound quality with the sound card. Long Battery Life: Wireless neckband monitoring headphone provides 9 hours of long battery life, no longer limited by battery life, suitable for stage, music studio, etc. Multipurpose: Multi function BT headset, can be inserted into the sound card device for live broadcast, karaoke, or used as a BT headset to connect to a mobile phone. Stable Signal: Wireless signal transmission of the neckband BT monitoring headset is stable, which perfectly solves the inconvenience of the wired method. Comfortable To Wear: Wireless monitoring earbud is neckband design, which can be worn for a long time without pressure. High quality ABS material, more durable.