Quantity 1 piece(s) Material Plastic + metal + electronic material Color Black Type Electronic device Function Allows up to 6 riders to connect to each other at the same time (only one set included need to buy more to connect each other). Bluetooth headset can connect to cellphone speaker audio speaker with Bluetooth function. Bluetooth Version 2.0+EDR Transmission Range 1000 m Intercom Function Yes Intercom Effective Distance 1000m FM Frequency 85~108 MHz Speaker Power 0.25 W Interface USB Power Supply Built-in 350mAh Li-polymer battery Working Current 5A Other Features Provide wireless hands free communication for motorcyclist good for safe driving. Enjoy stereo music from your mobile phone. Certification CE Packing List 1 x Bluetooth interphone 1 x EU plug power adapter (100~240V) 1 x Headphone 2 x Clips 2 x Screws 1 x USB data + charging cable (60cm) 1 x English / Chinese user manual