... 21 keys 3,Plastic keypad 4,Net weight: 33g ir remote control It is designed with small size, beautiful exterior , Sound wave ... current: ≤ 30mA; 3,Transmitting power: > 15mw 4,Operating frequency: 315,430,433 MHZ (available for customer appointment) 5,Transmitting distance ... USB reader speaker, portable FM radio speaker, MP3 decoder board, Car no disk drive , Magic ball stage light mp3 decoder board ...