simolio 2.4g wireless tv speaker system, wireless soundbox for seniors, wireless speakers for tv listening, voice clear portable tv speakers for hearing impaired, extra headset & adapter sm-621 simolio <b>important!</b><br>1.before purchasing, check audio output of your tv/audio source first, make sure it has red/white jacks labeled “audio out”.if only with optical audio out jack, then you need speaker model sm-621d,not sm-621 (search simolio sm-621d on amazon).<br>< br>2.place the base 3 feet away from wifi tv box/tv sticks.<br><br><b>features:</b><br>1.the wireless tv speaker brings clear and crisp tv sound at your side, while others in your family can enjoy tv at normal voice. an under-chin designed headset is provided for quiet listening.<br><br>2.latest 2.4ghz digital automatic fhss (frequency hopping spread spectrum) tech promises super sound reproduction, no need pairing, no signal delay. up to 100 feet operation range. it’s stronger penetrability can go through ceilings or walls, you can sit at any position or take it to somewhere in your house to hear tv/listen music.just turn on the big knob to your volume level. ideal for the elders with hearing issues.<br><br>3.2 power adapters: one for transmitter; another for speaker to be plugged in the wall outlet, no need taking the speaker back into the cradle to charge.<br><br>4. six hours battery working on a full charge.<br><br>5.the wireless tv sound box will automatically shut off after 3 minutes when no audio is detected to ensure maximum battery life.<br><br>6.built-in short-circuit protection circuit ensures the absolute safety.<br><br>7.3 levels of tones (treble/normal/bass) on the back of the sound bar to enhance clarity of tv dialog.<br><br>8.the speaker receiver can be independently used as a wired speaker for mp3, pc, mobile phone, ipad, etc.<br><br>10.big size appearance and acoustic chamber with powerful loudspeaker 2*5w.<br><br>all accessories included in the box.