Panasonic RP-NJ310B

Lightweight Bluetooth in-ears with dense, bass-driven sound

Panasonic’s wireless in-ears RP-NJ310B are designed for rich, punchy bass reproduction while offering decent sound quality, despite their low price. The lightweight earpieces are also equipped with a practical quick charge function and a 3-button remote with integrated microphone for controlling Android and iOS devices.

Thanks to their ergonomic shape, the in-ears sit comfortably, don’t cause pressure problems even when worn for long periods and offer sufficient stability in everyday use. The system is only of limited use for sporting activities, as it doesn’t provide sufficient support for use with high vibrations or fast, jerky movements. The earphones, which are primarily made of plastic, do not give a high-quality first impression, but they are deceptively robust. In my opinion, the only criticism would be the noises made which can impair the sound when the connecting cable element at the neck comes into contact with clothing,

The energy is supplied by a lithium-polymer battery with a capacity of 110 mAh, which can be charged quickly and allows continuous use of approx. 90 minutes after fifteen minutes of charging. Even at full capacity, the extremely light earpiece, weighing just 15 grams, proved to be very powerful in practice and achieved a total time of over seven hours despite the higher level. A complete charging cycle via the supplied USB charging cable then takes just under two hours.

Device control

Pair the earpieces, which support Bluetooth standard 4.2, by holding down the central remote button, switching the system on and then directly into pairing mode. If a radio connection is established, the button is used to control the Play/Stop function of the device as well as to accept and end telephone calls. Double-clicking, on the other hand, can activate language assistants. In addition, separate plus and minus buttons offer volume control while holding down these same buttons also enables title navigation. The plus button moves forward through tracks and the minus button can be used to jump back, and the remote performs these functions reliably and without delay. When used with various iOS and Android systems, there were no connection problems and stable ranges of seven to eight metres could be achieved. On the other hand, the quality of the integrated microphone appeared to be limited, since it can make your own voice sound rather dull and quiet, making speech intelligibility constrained during calls.


The RP-NJ310B boasts a powerful bass, which seems to live up to the hype. The earpieces are bass tuned and have a powerful output that offers high reserves. In spite of the impressive bass foundation, which extends into the deep bass range, the sound is round and harmonious, even if the basses are slightly dull. The mids, on the other hand, seem rather reserved and reproduce vocals very softly, while the rounded, low-distortion trebles have presence, although they drop slightly. I like the fact that the in-ears already sound rich and full at lower levels so that high volume is not needed to make modern pop, dance, electro, hip-hop or R’n’B productions fun to listen to. At the same time, the listeners can also, if desired, have the volume turned up to experience a club feeling. Complex, extensive arrangements, however, are not necessarily part of the recommended repertoire, as the stereo stage is rather compact and its strengths lie in a direct, dense sound.

Maike Paeßens
11 months ago by Maike Paeßens
  • Rating: 3.88
  • Sound
  • Handling
  • Price/Quality
  • Function

The focus of Panasonic’s RP-NJ310B is clearly on a strong bass reproduction, and the Bluetooth earpieces can handle this skilfully at both low and high levels. Advantages are the comfortable seat, the low weight, a credible running time and the quick charging function. The presence of cable noise, on the other hand, is a weak point.

Technical specifications

  • Ear couplingIn-ear
  • Typeclosed
  • Transducer principledynamic
  • Frequency response (headphones)20 - 20.000 Hz
  • Weight without cable14 g

What's in the box

  • Ear tips in 3 sizes (S, M, L)
  • USB charging cable

Special features

  • available in black, white, red, blue and green
  • BT codecs: SBC
  • BT version: 4.2
  • BT profiles: A2DP, AVRCP, HSP, HFP