The Sheepdog HDLO, covert 2.5mm listen only police earpiece is reversible, allowing officers to wear the receive only earpiece on either the right or left ear. Engineered for complete situational awareness, the HDLO is lightweight, nearly invisible and delivers premium voice audio directly to the user's ear via a Knowles armature micro-speaker. Despite their tiny size, balanced armature drivers offer incredibly detailed and accurate sound. Their thin, lightweight diaphragms are highly responsive for unprecedented clarity. And because the coil doesn't move, more copper can be used, resulting in lower power consumption. The HDLO offers discreet, best-in-class voice communications and unsurpassed comfort. To use, simply connect to your two-way radio speaker microphone via the 2.5mm earpiece audio port. The Sheepdog HDLO is the only tubeless listen only earpiece designed for use with traditional ear inserts, custom earmolds and standard eartips. The Sheepdog HDLO includes 1x Cable Clip, 1x Cable Guide, 1x Medium Fan Eartip, 1x Large Fan Eartip. PROFESSIONAL: Discreet 2.5mm covert listen only earpiece. Tubeless design eliminates moisture build-up and discoloration. Specifications: 2.5mm Connector, 24 Inch cable with coil. EAR OPTIONS: The HDLO Series is the only tubeless listen only earpiece compatible with standard acoustic tube style ear inserts, such as semi-custom open ear inserts, earmolds, mushroom earbuds, silicone gel inserts, select foam high noise earplugs. AWARENESS: Unsurpassed comfort and situational awareness. This earpiece allows for ambient sound to enter the ear (depending on ear insert choice). No ear fatigue - Meant for all day use. Low-profile durable cabling. Coiled cord allows user to move head freely. AUDIO: Premium voice audio - Receive crisp 10-2 receive (RX) audio from dispatch and other LEOs. Mini-HD speaker is located near the ear. No need to use radio at max volume.