The PRO‑SONIC wireless audio system generates audio using advanced wireless technology to achieve clear sound with minimal perceivable time delay. The PRO‑SONIC Receive Module features an internal loudspeaker and a 6.35mm (¼") headphone socket for use with your choice of headphones. It can be attached to your harness or clothing using the metal belt clip. Features: Use headphones or built-in speaker Adjustable volume setting 10 m / 32-feet operating range SDC 2300 adaptor cable included Charge from your car, AC power or USB charger Compatible Metal Detectors GPX 5000 GPX-4500 SDC 2300 E-TRAC Safari X-TERRA 705 X-TERRA 505 X-TERRA 305 Wireless Technology The PRO-SONIC Transmit Module sends out low-power (mW) radio waves using the ISM frequency band (2.402 – 2.480Ghz). The PRO-SONIC Receive Module senses these signals and establishes a piconet communication network with the Transmit Module, using frequency hopping to eliminate interference from other wireless devices. Everything You Need The PRO-SONIC system contains everything you need for clear, fast, wireless audio. PRO-SONIC is compatible with any detector, and comes with an SDC adapter cable and a handy car charger for charging on the go. Receive and Transmit modules Universal Charger (AC and car charger) SDC 2300 adapter cable Transmit Module Audio Cable (6.35mm/1/4-inch) Dual Charging Cable (1 × USB-A, 2 × USB Micro-B) Getting Started Guide