The MZ-4 is compact yet powerful 5W portable wireless speaker. The MZ4 has TWS so you can pair with another MZ4 speaker and has built-in mic for speakerphone functionality. The MZ-4 has a powerful lith-ion rechargeable battery giving up to 24 hours play time. Complete with carry strap Features: Powerful 5 Watts audio driver V5.0 Bluetooth Wireless chipset Lith-ion rechargeable battery with up to 24 hours play time IPX4 Waterproof rating Compact and portable size with carry strap Designed in the UK Speaker size 52mmFrequency 100Hz-16KHzBattery 1200mAh/3.7VPlayback time Up to 26 hoursCharge time 2.5 hoursCharging Input/ Output (Volts) 5V Operating range Up to 10mBluetooth version v5.0Waterproof rating IPX4USB cable length 50cm Battery Power (W) 5WBattery Voltage (V) 3.7v Dimensions 93mm x 95mm x 48mm Specifications: Dimensions: H:4.8 x W:9.5 x D:9.3 cm Weight: 0.3 kg Colour: Red Model Number: VSS-443-MZ4-RD