Features: 100%?brand?new?and?high?quality Hi-Fi?Bluetooth?receiver?which?has?built-in?rechargeable?polymer?battery，?multi-functional?buttons，?easy?and?convenient?to?use. It?is?built?with?the?most?advanced?Bluetooth?chip?4.1?versions. Hi-Fi?Bluetooth?receiver?can?make?your?vehicle-mounted?stereo?speaker?or?home?stereo?speaker?as?a?Bluetooth?speaker. Built-in?chip?can?enhance?signal?transmission?circuit. Fast?connection，?long-distance?connection，?steady?sound?quality?and?no?staccato The?AEC?echo?cancellation?circuit?and?ANC?Noise?elimination?circuit?of?built-in?chip?keep?the?sound?quality?our?and?clear. Our?HIFI?Bluetooth?Receive?has?function?of?automatically?memory?connection. Specifications: Color:?Black Material:?Plastic Bluetooth?version:?4.1 Compatible?with:?Phone/tablet?PC?of?Android?system?，IOS?system，?and?all?Bluetooth?audio?devices?ect. Transmission?distance:?20M(open?areas) Working?current:?18—28MA Battery?standard:?300MA Charging:?3H Output?connection?mode:?3.5MM?stereo?audio?port Size:?11cm?x?6cm?x?1.5cm Packing?includes: 1?x?Bluetooth?receiver 1?x?3.5mm?Audio?connecting?cable 1?x?USB?charging?cable 1?x?1-to-2?AV?cable