simolio wireless portable tv speakers with tv audio listening assistance, voice highlighting tv speakers for hard of hearing, seniors and elderly, 100ft range, extra headset & 2 adapters -sm-621d simolio important <br>1. wireless tv speakers compatible with optical (spdif), analog rca & 3.5mm audio connection. when making an optical connection, set the digital output audio format of the tv to pcm.<br><br>2.place the transmitter base at least 4 feet away from wifi smart tv/tv box/router.<br><br><b>features:</b><br>1.the digital wireless tv amplifier speakers bring clear and crisp tv sound at your side, while others in the room can enjoy tv at a normal volume. an under-chin headset is provided for plugging into the speaker for quiet listening.<br><br>2.latest 2.4ghz digital automatic fhss (frequency hopping spread spectrum) tech promises super sound reproduction, no need to pair, 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.built-in digital optical (toslink) audio input, enjoy top quality audio from your hdtv.<br><br>4.2 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>5. six hours battery working on a full charge.<br><br>6.the wireless tv sound box will automatically shut off after 3 minutes when no audio is detected to ensure maximum battery life.<br><br>7.built-in short-circuit protection circuit ensures the absolute safety.<br><br>8.3 levels of tones (treble/normal/bass) on the back of the tv speaker to enhance clarity of tv dialog.<br><br>9.the portable speaker 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.