Audio Technica ATW-T62a 800MHz Band UHF Wireless Microphone Wireless Microphones - Set of 2. Operation has been confirmed with wireless amplifier systems ATW-SP707a and ATW-SP808a. There are no problems. The exterior has some scratches and dirt due to use. Included accessories: The batteries shown. ★The batteries can be charged and discharged, but they are consumables and are not covered by the warranty. Since this is a used item, returns are not accepted except for initial operational defects. Specifications: Type: Unidirectional dynamic Oscillation method: Crystal-controlled PLL synthesizer Transmission frequency: 806.125～809.750MHz (30 channels) Radio wave type: F3E Tone signal: 32.768kHz Antenna power (transmission output): 10mW (50Ω) / RF Hi: 5mW (50Ω) / RF Lo Transmission frequency stability: Less than 20ppm Unnecessary radiation: Less than 2.5μW (50Ω) Standard frequency deviation: ±5kHz Maximum frequency deviation: ±40kHz Frequency characteristics: 100～15,000Hz Maximum allowable input: 130dB・SPL Power supply: DC2.4～3V (When using dedicated nickel-metal hydride batteries or 2 AA alkaline batteries) Continuous operating time: Approximately 9 hours (RF-Hi) when using dedicated nickel-metal hydride batteries Approximately 10 hours (RF-Hi) when using AA alkaline batteries Operating temperature range: 5～45℃ External dimensions: φ59×256mm (head diameter × total length) Weight: Approximately 304g (including dedicated nickel-metal hydride rechargeable battery)