Specification: Color: Black+Transparent Listening only earpieces feature Electroplating anti-oxidation coating. The durable PU cable can withstand 5-10kg. The maximum working length of the cable including the earbud is 88cm. Interchangeable universal acoustic tube. The 3.5mm jack can be used for general monitoring devices, such as 3.5mm jack's phones, computers, MIC, radios etc Practical Ergonomically designed. Mushroom earbud - comfortable for long use. walkie talkie earpiece are suitable for security guards, construction workers, waiters, police, attendants, staff, surveillance, hospitals, restaurants, schools, hotels, bars, warehouse etc. parameter Output Level: 72Db Rated Input Power: 0.1W Maximum Input Power: 0.2W Output Impedance: 32 ohms Works with the following devices: Compatible with MOTOROLA KENWOOD (KMC-25 KMC-26) ICOM radio remote mic speak mic with a 3.5mm earphone jack.