Silicon Rubber Keypads, comfortable and easier to operate. With removable wireless microphone, Headset or Handheld 2 IN 1. Rechargeable voice amplifier: Very long operating time --- up to 15 hours clear & loud amplification with a single fully charged. SOUND COVERS 5,300+ SQ FT – powerful waistband voice amplifier delivers amazing sound & excellent clarity; amplifies your voice across larger Auditoriums. UHF Wireless amplifier, with 40m/130ft wireless transmission technology, no need to carry the device any more, completely hands-free, more convenient and comfortable. Small and exquisite, portable, amplification function anytime and anywhere. Widely used: teaching, tour guide, sales promotion, yoga, lectures, meetings, karaoke, fans singing, morning exercise, dance, training and so on purpose. How to Pair Step 1 Turn on the mini amplifiers and then press "M" Button until you see the blink blue light and then let go; Step 2 Turn on the wireless microphone and then press "+" button on the microphone around 3S and it will pair successfully. (Generally, it will automatically hook up the next time you use it. Turn on & Use) Specs & Details Output power: 10W Sound coverage: 500㎡/5,300+ sq.ft Charging Voltage: DC 5V, 500mA Battery: 3.7V, 1800mAh Amp working time: with 50% volume; 10~15hours (MIC mode); Wireless mic working time: with 50% volume; 3~4hrs, with 100% vol; 1-2hrs. Charging time: 3-5 hours Product size: 8.6x2.8x10.6cm/3.4x1.1x4.2in Unit weight: 173g/0.38lb Working temperature: -10℃~45℃ Frequency response: 90Hz~18KHz Tips for charge S615 Personal Voice Amplifier Charging time:　3-5hrs Working time: 10-15 (mic mode) [charge indicator] Charging: flashing red light; Fully charged: steady red light. Wireless Mic Charging time:　2-3hrs Working time: with 50% volume; 3~4hrs, with 100% vol; 1-2hrs. [charge indicator] Charging: steady red light; Fully charged--red light go out Does not come with box or headphones. It is New.