STR-100 / STRC-100 Frequency Band: UHF Output power: + 10 dbm Modulation: NFM / WFM Power supply: 110 / 220 vac Antenna: 180 mm, external Microphone external / extension, Knowles Dimensions: 2 x (32 x 13 x 8) mm ------------------------------------------ STR-200 / STRC-200 Frequency band: uhf Output power: + 10 dbm Modulation: NFM / WFM Power supply: from telephone line Antenna: 180 mm, external Connection series with telephone set Dimensions: 32 x 13 x 8 mm ------------------------------------------ STR-300 / STRC-300 Frequency Band: UHF Output power: + 3 dbm Modulation: NFM / WFM Power supply: 3 vdc (1 x cr2032) Operation time no less than 36 hours Antenna: 180 mm, external Microphone: internal / built-in, Knowles Dimensions: 28 x 20 x 8 mm ------------------------------------------ STRC-400 Frequency (transmitter) : 400 MHz ~440 MHz Output Power (setting with remote control) : low power + 10 dBm high power + 18 dBm Modulation: FSK @ 100 kHz Audio coding nonlinear PCM Audio dynamic range compression ratio: 15 dB Frequency (remote control receiver) : 315 MHz Power Supply: 3. 6v (Li-pol battery 230 mA / h) Operation time: Standby no less than 10 months TX low power 5 hours TX high power 1. 5 hours Antenna: 180 mm Microphone: built-in, Knowles (optional-extension) Dimensions: 48 x 23 x 12 mm Charger: 5VDC, 500mA Charging time: 120 min ------------------------------------------ STV-02 Built-in remote control transmitter 100 memory chnanel capacity WFM / NAM Modulation Adjustable frequency step Tone control Search funcation Scan funcation Li-polymer rechargeable battery Fast charging time Compatible with STRC-100 / 200 / 300 / 400 Currency: USD