The LA-164 speaker is placed over the ear and connects to a Listen LR-300, LR-400, or LR-500 receiver. Ideal for users who don't want anything inside their ear (doesn't enter the ear canal). Works well with hearing aids. Comfortable and easy to use. Outstanding aural performance. Frees up one ear for hearing environment sounds. Durable black plastic can be cleaned after each use. Ideal for almost all applications: tour groups; language interpretation; schools; houses of worship; rentals; medium ambient noise environments; while wearing hard hats or hearing aids. Use with any Listen Technologies receiver. Receiver's antenna is built in to the headphone cord. 3.5mm mono connector. 36 inch cord length. Ninety day warranty.