SQ-7100 handheld transmitter Features Multi-function LCD display for channel/frequency, sensitivity, battery level indicator, Alkaline/NiMH battery selection. Rotatable protective cap hides the function keys for fool-proof operation. Power-On LED. Hidden antenna. Detachable microphone capsule design. Selection of either Dynamic or Condenser. Handling noise free with condenser microphone capsule. Rubberized coating. Multi-color cap for channel identification. Uses 2 pieces of AA batteries to operate. Long operating hour up to 12 hours. Matching battery charger: HC-30, HC-37   Specifications Model SQ-7100 Frequency Range UHF High Band 600 - 900 MHz Switching Bandwidth 25 MHz Switchable Frequency 100 RF Power Output < 35mW** Spurious Emission > 60 dB below carrier Dynamic Range > 110 dB Display Screen LCD T.H.D < 0.5% Peak Deviation ± 40 KHz Antenna Built in Battery Type AA x 2 Operating Life about 12 hours (Alkaline) Charging Function YES Battery charger HC-30 Microphone Capsule Dynamic/Condenser type Dimension (mm) φ46 x 240 Weight (g) 200 Patent & Approval CE,FCC ** Remark: The above specifications are subject to change without prior notice. The output power may vary from country to country.