Features:Ear of God ER151 Bluetooth stereo three defenses (waterproof and dustproof shockproof)， the world's top tier acoustic quality， build first-class Bluetooth stereo listening enjoyment， Bluetooth capabilities， the effective distance up to 10M， A2DP wireless stereo transmission， surging bass， mini-Technica shape， small and unique， built-in 1500 mAh polymer lithium-ion battery with high quality， support for up to 8 hours playback， support recharged 1000 times (three times more than conventional lithium batteries charging times) dual speakers 2 * 2W， with the latest Bluetooth digital amplifier maximum output power of 15 watts， the sound loud and clear. Ortega passive bass diaphragm patented technology， 2.1 stereo sound， allowing you to enjoy cinematic sound listening ear God speakers. Specifications:Sound Type: portable Bluetooth audioBluetooth Version: 2.1 + EDRTransmission distance: 10 metersRated Power: 4WFrequency response: 60Hz-20KHzThe speaker unit: 2x1.5 inchesImpedance: 4��Channel system: 2.0 channelActive Passive: ActiveControl: KeyDesigns: body with a structurally stable equilateral trianglePackaging Weight: 480gProduct Dimensions: 150X56X56mmPackage Included:Bluetooth Speaker*1， USB Cable*1， Audio Cable*1， User Manual*1， Layard*1