Compatible with a range of Minelab Metal Detectors, the ML 85 Wireless Headphones offer up to 40 hours of battery life, as well as an operating range up to 10 metres._Wireless headphonesCompatible with MANTICORE, EQUINOX 900, EQUINOX 700 and X-TERRA PRO detectorsChipset: Nordic nRF5340Operating Range: up to 10mCharging Time: 3 hoursOperating Time: 35-40 hoursOperating frequency: 2.4-2.485GHzAudio output power: 15mW x 2Power of supply: 0.1WDimensions (unfolded): L21.0 x W16.0 x H8 cmDimensions (folded): L21.0 x W16.0 x H5 cmWeight: 221g_