| Revew | Avantree Audiplex 2403S Wireless Audio Transmitter and Receiver SetThe Avantree Audiplex 2403S is a set of one transmitter and three wireless receivers that streams audio from one source to several headphones or speakers at once. The transmitter connects to a TV, projector, stereo receiver or Blu-ray player through an optical or 3.5 mm AUX output, and each receiver connects to headphones or a speaker through an AUX jack. The set uses 2.4GHz technology, not Bluetooth, so latency is under 30ms and sound stays in sync with the picture even with many receivers connected. Each receiver has independent volume control, a USB-C rechargeable battery and a clip, and up to 100 receivers can be added to one transmitter. 
Key features- One transmitter, many listeners - Three receivers are included, and more can be paired, up to 100 per transmitter, for shared viewing, conferences, theater performances and outdoor movies.
- Low latency - 2.4GHz technology cuts latency to under 30ms, compared with about 220ms for standard Bluetooth, so sound stays in sync with the picture.
- Volume control on every receiver - Each listener sets the volume on their own receiver without affecting anyone else.
- Optical or AUX input - The transmitter takes audio from any source with an optical (PCM) or 3.5 mm AUX output, and an AUX to RCA cable is included.
- Rechargeable batteries - Receivers run up to 7 hours and the transmitter up to 4 hours, a full charge takes about 1.5 hours, and the units can be used while charging.
- Small and light - Each unit measures 65 x 45 x 16 mm and weighs 30 g, with a clip for a belt or shirt and simple buttons for pairing and volume.
Specifications| Manufacturer | Avantree | | Model | Audiplex 2403S | | Part number | AV-WSTR-2403-S | | Type | Wireless set: one transmitter and three receivers | | Technology | 2.4GHz (2.401-2.483GHz), not Bluetooth | | Range | Up to 30 m | | Latency | Under 30ms | | Receivers | 3 included, up to 100 per transmitter | | Transmitter inputs | Optical (PCM, 16bit/48kHz), 3.5 mm AUX | | Receiver output | 3.5 mm AUX | | Frequency response | 20Hz-20kHz | | Signal-to-noise ratio | 94dBA | | THD | Under 0.2% | | Operating time | Transmitter up to 4 h, receiver up to 7 h | | Standby time | Up to 30 days | | Battery and charging | 450mAh, about 1.5 h charging, USB-C 5V | | Dimensions | 65 x 45 x 16 mm per unit | | Weight | 30 g per unit | | Color | White transmitter, black receivers |
In the box- Transmitter
- 3 receivers
- USB-A to USB-C charging cable, 1.5 m
- 3-in-1 USB-A to USB-C charging cable, 60 cm
- Optical audio cable, 1.5 m
- 3.5 mm AUX audio cable, 1.5 m
- 3.5 mm AUX to RCA cable, 35 cm
- 3 x 3.5 mm AUX cables for the receivers, 60 cm
- 3 attachment clips
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